JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank

done Hydrogenion concentration pH scale and buffer solution Total Questions - 206

• question_answer1)
  The \[pH\] of blood does not appreciably change by a small addition of an acid or a base because blood [CBSE PMT 1995]
  A)
                  Contains serum protein which acts as buffer                                       done clear
  B)
                  Contains iron as a part of the molecule done clear
  C)
                  Can be easily coagulated done clear
  D)
                  It is body fluid done clear
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• question_answer2)
  The \[pH\] of a \[0.001\,M\,NaOH\] will be                 [MP PMT 1995; UPSEAT 2001]
  A)
                  3              done clear
  B)
                  2 done clear
  C)
                  11           done clear
  D)
                  12 done clear
  View Solution play_arrow

• question_answer3)
  pH value of a solution, whose hydronium ion concentration is \[6.2\times {{10}^{-9}}mol/\,l,\] is               [AFMC 1999; AIIMS 2000]
  A)
                  6.21        done clear
  B)
                  7.21 done clear
  C)
                  7.75        done clear
  D)
                  8.21 done clear
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• question_answer4)
  0.1 mole of CH3NH2 (Kb = 5 ´ 10-4) is mixed with 0.08 mole of HCl and diluted to one litre. What will be the H+ concentration in the solution?                         [IIT 2005]
  A)
                  8 ´ 10-2 M           done clear
  B)
                  8 ´ 10-11 M done clear
  C)
                  1.6 ´ 10-11 M      done clear
  D)
                  8 ´ 10-5 M done clear
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• question_answer5)
  What will be the sum of \[pH\]and \[pOH\] in an aqueous solution ?                                       [MP PET/PMT 1998]
  A)
                  7              done clear
  B)
                  \[p{{k}_{w}}\] done clear
  C)
                  Zero       done clear
  D)
                  1 done clear
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• question_answer6)
  Hydrogen ion concentration in mol/L in a solution of \[pH=5.4\] will be   [AIEEE 2005]
  A)
                  \[3.98\times {{10}^{8}}\]              done clear
  B)
                  \[3.88\times {{10}^{6}}\] done clear
  C)
                  \[3.68\times {{10}^{-6}}\]             done clear
  D)
                  \[3.98\times {{10}^{-6}}\] done clear
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• question_answer7)
  When solid potassium cyanide is added in water then  [CPMT 2002; BHU 2002]
  A)
                  pH will increase done clear
  B)
                  pH will decrease done clear
  C)
                  pH will remain the same done clear
  D)
                  Electrical conductivity will not change done clear
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• question_answer8)
  pH of a \[{{10}^{-3}}M\] solution of hydrochloric acid will be [MP PET 2000]
  A)
                  1.3          done clear
  B)
                  2.0 done clear
  C)
                  3.0          done clear
  D)
                  4.5 done clear
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• question_answer9)
  The \[pH\]of water at \[{{25}^{o}}C\] is nearly [CPMT 1986, 89, 90, 93; CBSE PMT 1989; MADT Bihar 1995]
  A)
                  2              done clear
  B)
                  7 done clear
  C)
                  10           done clear
  D)
                  12 done clear
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• question_answer10)
  \[pH\] of a solution is 5. Its hydroxyl ion concentration is [JIPMER 1999]
  A)
                  5              done clear
  B)
                  10 done clear
  C)
                  \[{{10}^{-5}}\]   done clear
  D)
                  \[{{10}^{-9}}\] done clear
  View Solution play_arrow

• question_answer11)
  The \[pH\] of a solution in which the \[[{{H}^{+}}]=0.01,\]is [MADT Bihar 1980]
  A)
                  2              done clear
  B)
                  1 done clear
  C)
                  4              done clear
  D)
                  3 done clear
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• question_answer12)
  At 25°C, the dissociation constant of a base BOH is \[1.0\times {{10}^{-12}}\]. The concentration of Hydroxyl ions in 0.01 M aqueous solution of the base would be [CBSE PMT 2005]
  A)
                  \[2.0\times {{10}^{-6}}mol\,{{L}^{-1}}\] done clear
  B)
                  \[1.0\times {{10}^{-5}}mol\ {{L}^{-1}}\] done clear
  C)
                  \[1.0\times {{10}^{-6}}mol\,{{L}^{-1}}\] done clear
  D)
                  \[1.0\times {{10}^{-7}}mol\ {{L}^{-1}}\] done clear
  View Solution play_arrow

• question_answer13)
  Aqueous solution of \[HCl\] has the \[pH=4\]. Its molarity would be                                        [RPMT 1999]
  A)
                  4 M        done clear
  B)
                  0.4 M done clear
  C)
                  0.0001 M              done clear
  D)
                  10 M done clear
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• question_answer14)
  Which is a buffer solution [CPMT 1985, 88; AIIMS 1980; MP PMT 1994; AFMC 2004]
  A)
                  \[C{{H}_{3}}COOH+C{{H}_{3}}COONa\] done clear
  B)
                  \[C{{H}_{3}}COOH+C{{H}_{3}}COON{{H}_{4}}\] done clear
  C)
                  \[C{{H}_{3}}COOH+N{{H}_{4}}Cl\] done clear
  D)
                  \[NaOH+NaCl\] done clear
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• question_answer15)
  The addition of solid sodium carbonate to pure water causes [NCERT 1973]
  A)
                  An increase in hydronium ion concentration done clear
  B)
                  An increase in alkalinity done clear
  C)
                  No change in acidity        done clear
  D)
                  A decrease in hydroxide ion concentration done clear
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• question_answer16)
  The aqueous solution of which of the following salt has the lowest pH                                    [CBSE PMT 2002]
  A)
                  \[NaClO\]            done clear
  B)
                  \[NaCl{{O}_{2}}\] done clear
  C)
                  \[NaCl{{O}_{3}}\]             done clear
  D)
                  \[NaCl{{O}_{4}}\] done clear
  View Solution play_arrow

• question_answer17)
  The \[pH\] of a \[{{10}^{-10}}M\,NaOH\] solution is nearest to [UPSEAT 2001, 02]
  A)
                  10           done clear
  B)
                  7 done clear
  C)
                  4              done clear
  D)
                  \[-10\] done clear
  View Solution play_arrow

• question_answer18)
  Which will have maximum \[pH\]             [NCERT 1979]
  A)
                  Distilled water done clear
  B)
                  \[1\,M\,\,N{{H}_{3}}\] done clear
  C)
                  \[1\,M\,\,NaOH\] done clear
  D)
                  Water saturated by chlorine done clear
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• question_answer19)
  pH of a solution is 9.5. The solution is      [MH CET 2000]
  A)
                  Neutral                 done clear
  B)
                  Acidic done clear
  C)
                  Basic      done clear
  D)
                  Amphoteric done clear
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• question_answer20)
  The \[pH\] of a \[{{10}^{-9}}M\] solution of \[HCl\] in water is  [UPSEAT 2000, 02]
  A)
                  8              done clear
  B)
                  ? 8 done clear
  C)
                  Between 7 and 8              done clear
  D)
                  Between 6 and 7 done clear
  View Solution play_arrow

• question_answer21)
  \[pH+pOH\]equal to       [NCERT 1975]
  A)
                  Zero       done clear
  B)
                  Fourteen done clear
  C)
                  A negative number         done clear
  D)
                  Infinity done clear
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• question_answer22)
  Which of the following 0.1M solution will contain the largest concentration of hydronium ions    [NCERT 1971, 73]
  A)
                  \[NaHC{{O}_{3}}\]           done clear
  B)
                  \[N{{H}_{4}}Cl\] done clear
  C)
                  \[HCl\]  done clear
  D)
                  \[N{{H}_{3}}\] done clear
  View Solution play_arrow

• question_answer23)
  Which one has \[pH\] 12               [Roorkee 1995]
  A)
                  \[0.01\,M\,\,KOH\]         done clear
  B)
                  \[1\,N\,\,KOH\,\,ml\] done clear
  C)
                  \[1\,N\,NaOH\,\,ml\]     done clear
  D)
                  \[3.0\times {{10}^{-7}}\,M\] done clear
  View Solution play_arrow

• question_answer24)
  What is the correct relationship between the \[pHs\] of isomolar solutions of sodium oxide \[(p{{H}_{1}})\], sodium sulphide \[(p{{H}_{2}}),\] sodium selenide \[(p{{H}_{3}})\] and sodium telluride \[(p{{H}_{4}})\]?             [CBSE PMT 2005]
  A)
                  \[p{{H}_{1}}>p{{H}_{2}}=p{{H}_{3}}>p{{H}_{4}}\] done clear
  B)
                  \[p{{H}_{1}}<p{{H}_{2}}<p{{H}_{3}}<p{{H}_{4}}\] done clear
  C)
                  \[p{{H}_{1}}<p{{H}_{2}}<p{{H}_{3}}=p{{H}_{4}}\] done clear
  D)
                  \[p{{H}_{1}}>p{{H}_{2}}>p{{H}_{3}}>p{{H}_{4}}\] done clear
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• question_answer25)
  Given pH of a solution A is 3 and it is mixed with another solution B having pH 2. If both mixed then resultant pH of the solution will be  [BHU 2005]
  A)
                  3.2          done clear
  B)
                  1.9 done clear
  C)
                  3.4          done clear
  D)
                  3.5 done clear
  View Solution play_arrow

• question_answer26)
  On adding solid potassium cyanide to water [MP PMT 1989]
  A)
                  pH will increase done clear
  B)
                  pH will decrease done clear
  C)
                  pH will not change           done clear
  D)
                  Electrical conductance will not change done clear
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• question_answer27)
  A is an aqueous acid; B is an aqueous base. They are diluted separately, then     [KCET 2002]
  A)
                  \[pH\] of A increases and \[pH\] of B decreases done clear
  B)
                  \[pH\] of A increases and \[pH\] of B decreases till \[pH\] in each case is 7 done clear
  C)
                  \[pH\] of A and B increase done clear
  D)
                  \[pH\] of B and A decrease done clear
  View Solution play_arrow

• question_answer28)
  The compound whose 0.1 M solution is basic is [IIT 1986; MP PMT 1991]
  A)
                  Ammonium acetate done clear
  B)
                  Calcium carbonate done clear
  C)
                  Ammonium sulphate done clear
  D)
                  Sodium acetate done clear
  View Solution play_arrow

• question_answer29)
  The following reaction is known to occur in the body \[C{{O}_{2}}+{{H}_{2}}O\] ⇌ \[{{H}_{2}}C{{O}_{3}}\] ⇌ \[{{H}^{+}}+HCO_{3}^{-}.\] If \[C{{O}_{2}}\]escapes from the system          [NCERT 1973; RPMT 1997]
  A)
                  \[pH\] will decrease done clear
  B)
                  Hydrogen ion concentration will decrease done clear
  C)
                  \[{{H}_{2}}C{{O}_{3}}\] concentration will be unaltered done clear
  D)
                  The forward reaction will be promoted done clear
  View Solution play_arrow

• question_answer30)
  For preparing a buffer solution of \[pH\]6 by mixing sodium acetate and acetic acid, the ratio of the concentration of salt and acid should be\[({{K}_{a}}={{10}^{-5}})\]      [MP PET 1997]
  A)
                  \[1\,\,:\,\,10\]   done clear
  B)
                  \[10\,\,:\,\,1\] done clear
  C)
                  \[100\,\,:\,\,1\] done clear
  D)
                  \[1\,\,:\,\,100\] done clear
  View Solution play_arrow

• question_answer31)
  Which is incorrect for buffer solution      [CPMT 1985]
  A)
                  It contains weak acid and its conjugate base done clear
  B)
                  It contains weak base and its conjugate acid done clear
  C)
                  In this there is very less change is \[pH\] value when very less amount of acid and base is mixed done clear
  D)
                  None of the above done clear
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• question_answer32)
  \[pH\]values of \[HCl\] and \[NaOH\] solutions each of strength \[\frac{N}{100}\] will be respectively    [MP PMT 1999]
  A)
                  2 and 2  done clear
  B)
                  2 and 12 done clear
  C)
                  12 and 2               done clear
  D)
                  2 and 10 done clear
  View Solution play_arrow

• question_answer33)
  When rain is accompained by a thunderstorm, the collected rain water will have a pH value         [AIEEE 2003]
  A)
                  Slightly lower than that of rain water without thunderstorm done clear
  B)
                  Slightly higher than that when the thunderstorm is not there done clear
  C)
                  Uninfluenced by occurrence of thunderstorm done clear
  D)
                  Which depends on the amount of dust in air done clear
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• question_answer34)
  Which of the following is the buffer solution of strong acidic nature                                         [MP PET 2002]
  A)
                  \[HCOOH+HCO{{O}^{-}}\] done clear
  B)
                  \[C{{H}_{3}}COOH+C{{H}_{3}}CO{{O}^{-}}\] done clear
  C)
                  \[{{H}_{2}}{{C}_{2}}{{O}_{4}}+{{C}_{2}}O_{4}^{2-}\] done clear
  D)
                  \[{{H}_{3}}B{{O}_{3}}+BO_{3}^{3-}\] done clear
  View Solution play_arrow

• question_answer35)
  The dissociation constant of an acid HA is \[1\times {{10}^{-5}}\]. The \[pH\] of 0.1 molar solution of the acid will be [KCET (Engg./Med.) 1999]
  A)
                  Five        done clear
  B)
                  Four  done clear
  C)
                  Three    done clear
  D)
                  One done clear
  View Solution play_arrow

• question_answer36)
  The pH value of \[1.0\times {{10}^{-8}}M\,HCl\] solution is less than 8 because
  A)
                  \[HCl\] is completely ionised at this concentration done clear
  B)
                  The ionization of water is negligible done clear
  C)
                  The ionization of water cannot be assumed to be negligible in comparison with this low concentration of \[HCl\] done clear
  D)
                  The pH cannot be calculated at such a low concentration of \[HCl\] done clear
  View Solution play_arrow

• question_answer37)
  What is the pH for a neutral solutions at the normal temperature of the human body     [JIPMER 2000]
  A)
                  7.2          done clear
  B)
                  14.0 done clear
  C)
                  6.8          done clear
  D)
                  6.0 done clear
  View Solution play_arrow

• question_answer38)
  1 M \[NaCl\] and 1 M \[HCl\]are present in an aqueous solution. The solution is                [AIEEE 2002]
  A)
                  Not a buffer solution with pH < 7 done clear
  B)
                  Not a buffer solution with pH > 7 done clear
  C)
                  A buffer solution with pH < 7 done clear
  D)
                  A buffer solution with pH > 7 done clear
  View Solution play_arrow

• question_answer39)
  A solution has \[pH=5\], it is diluted 100 times, then it will become           [NCERT 1978; AFMC 2005]
  A)
                  Neutral                 done clear
  B)
                  Basic done clear
  C)
                  Unaffected         done clear
  D)
                  More acidic done clear
  View Solution play_arrow

• question_answer40)
  0.02 M monobasic acid dissociates 2% hence, \[pH\] of the solution is     [MH CET 2000]
  A)
                  0.3979   done clear
  B)
                  1.3979 done clear
  C)
                  1.699     done clear
  D)
                  3.3979 done clear
  View Solution play_arrow

• question_answer41)
  Components of buffer solution are \[0.1\,M\,HCN\] and \[0.2\,M\,NaCN\]. What is the pH of the solution           [RPET 2000]
  A)
                  9.61        done clear
  B)
                  6.15 done clear
  C)
                  2.0          done clear
  D)
                  4.2 done clear
  View Solution play_arrow

• question_answer42)
  pH of a solution of \[10\,ml\]. 1N sodium acetate and \[50\,ml\] 2N acetic acid \[({{K}_{a}}=1.8\times {{10}^{-5}}),\] is approximately                                                                 [MP PMT 2003]
  A)
                  4              done clear
  B)
                  5 done clear
  C)
                  6              done clear
  D)
                  7 done clear
  View Solution play_arrow

• question_answer43)
  By adding \[20\,ml\] \[0.1\,N\,HCl\] to \[20\,ml\] \[0.001\,N\,\] \[KOH,\] the pH of the obtained solution will be               [KCET 2000]
  A)
                  2              done clear
  B)
                  1.3 done clear
  C)
                  0              done clear
  D)
                  7 done clear
  View Solution play_arrow

• question_answer44)
  The pH of the solution containing \[10\,ml\] of a \[0.1\,N\,NaOH\] and \[10\,ml\] of \[0.05\,N\] \[{{H}_{2}}S{{O}_{4}}\] would be                                                 [Pb. PMT 2002, 04]
  A)
                  1              done clear
  B)
                  0 done clear
  C)
                  7              done clear
  D)
                  > 7 done clear
  View Solution play_arrow

• question_answer45)
  The \[pH\] of \[{{10}^{-7}}M\,NaOH\] is                [MP PMT 2001]
  A)
                  7.01        done clear
  B)
                  Between 7 and 8 done clear
  C)
                  Between 9 and 10            done clear
  D)
                  Greater than 10 done clear
  View Solution play_arrow

• question_answer46)
  The hydrogen ion concentration of \[0.1\,N\] solution of \[C{{H}_{3}}COOH,\] which is 30% dissociated, is            [JIPMER 2002]
  A)
                  0.03        done clear
  B)
                  3.0 done clear
  C)
                  0.3          done clear
  D)
                  30.0 done clear
  View Solution play_arrow

• question_answer47)
  What is the pH of \[0.1\,M\,N{{H}_{3}}\]              [RPET 2000]
  A)
                  11.27     done clear
  B)
                  11.13 done clear
  C)
                  12.0        done clear
  D)
                  9.13 done clear
  View Solution play_arrow

• question_answer48)
  By adding a strong acid to the buffer solution, the pH of the buffer solution                                         [DPMT 1996]
  A)
                  Remains constant            done clear
  B)
                  Increases done clear
  C)
                  Decreases           done clear
  D)
                  Becomes zero done clear
  View Solution play_arrow

• question_answer49)
  The pH of \[0.1\,M\,NaOH\] is   [MP PET 2003]
  A)
                  11           done clear
  B)
                  12 done clear
  C)
                  13           done clear
  D)
                  14 done clear
  View Solution play_arrow

• question_answer50)
  pH of human blood is 7.4. Then \[{{H}^{+}}\] concentration will be [RPMT 2002]
  A)
                  \[4\times {{10}^{-8}}\]   done clear
  B)
                  \[2\times {{10}^{-8}}\] done clear
  C)
                  \[4\times {{10}^{-4}}\]   done clear
  D)
                  \[2\times {{10}^{-4}}\] done clear
  View Solution play_arrow

• question_answer51)
  Assuming complete ionisation, the pH of \[0.1\,M\,HCl,\] is 1. The molarity of \[{{H}_{2}}S{{O}_{4}}\] with the same  pH is  [Pb. PMT 2002]
  A)
                  0.1          done clear
  B)
                  0.2 done clear
  C)
                  0.05        done clear
  D)
                  2.0 done clear
  View Solution play_arrow

• question_answer52)
  Highest pH 14 is given by              [DCE 1999]
  A)
                  \[0.1\,M\,{{H}_{2}}S{{O}_{4}}\] done clear
  B)
                  \[0.1\,M\,NaOH\] done clear
  C)
                  \[1N\,NaOH\]    done clear
  D)
                  \[1N\,HCl\] done clear
  View Solution play_arrow

• question_answer53)
  What will be the \[pH\]of a \[{{10}^{-8}}\,M\,HCl\] solution [MP PET/PMT 1998; RPET 1999;MP PMT 2000]
  A)
                  8.0          done clear
  B)
                  7.0 done clear
  C)
                  6.98        done clear
  D)
                  14.0 done clear
  View Solution play_arrow

• question_answer54)
  When 10 ml  of 0.1 M acetic acid \[(p{{K}_{a}}=5.0)\] is titrated against 10 ml of 0.1M ammonia solution \[(p{{K}_{b}}=5.0)\], the equivalence point occurs at pH          [AIIMS 2005]
  A)
                  5.0          done clear
  B)
                  6.0 done clear
  C)
                  7.0          done clear
  D)
                  9.0 done clear
  View Solution play_arrow

• question_answer55)
  Which on reaction with water will have \[pH\] less than 7 [MH CET 2001]
  A)
                  \[BaO\]                done clear
  B)
                  \[CaO\] done clear
  C)
                  \[N{{a}_{2}}O\] done clear
  D)
                  \[{{P}_{2}}{{O}_{5}}\] done clear
  View Solution play_arrow

• question_answer56)
  A solution of \[MgC{{l}_{2}}\] in water has pH [MP PMT 2002]
  A)
                  < 7          done clear
  B)
                  > 7 done clear
  C)
                  7              done clear
  D)
                  14.2 done clear
  View Solution play_arrow

• question_answer57)
  pH of completely dissociated \[0.005\,M\,{{H}_{2}}S{{O}_{4}}\] is [RPET 2003]
  A)
                  3              done clear
  B)
                  4 done clear
  C)
                  2              done clear
  D)
                  5 done clear
  View Solution play_arrow

• question_answer58)
  The \[p{{K}_{a}}\] of a weak acid is 4.8. What should be the ratio of [Acid]/[Salt] of a buffer if \[pH=5.8\] is required                                                 [MP PET 2003]
  A)
                  10           done clear
  B)
                  0.1 done clear
  C)
                  1              done clear
  D)
                  2 done clear
  View Solution play_arrow

• question_answer59)
  Which of the following salt is acidic [CPMT 1979, 81; NCERT 1979, 81; MP PET 1990; JIPMER 2002]
  A)
                  \[N{{a}_{2}}S{{O}_{4}}\]               done clear
  B)
                  \[NaHS{{O}_{3}}\] done clear
  C)
                  \[N{{a}_{2}}S{{O}_{3}}\]               done clear
  D)
                  \[N{{a}_{2}}S\] done clear
  View Solution play_arrow

• question_answer60)
  \[20ml\] of \[0.5N\,HCl\] and \[35\,ml\] of \[0.1N\,NaOH\] are mixed. The resulting solution will               [KCET 2005]
  A)
                  Be neutral done clear
  B)
                  Be basic done clear
  C)
                  Turn phenolphthalein solution pink done clear
  D)
                  Turn methyl orange red done clear
  View Solution play_arrow

• question_answer61)
  The \[pH\] of a 0.02 M solution of hydrochloric acid is [MP PMT 1993]
  A)
                  2.0          done clear
  B)
                  1.7 done clear
  C)
                  0.3          done clear
  D)
                  2.2 done clear
  View Solution play_arrow

• question_answer62)
  A sample of \[N{{a}_{2}}C{{O}_{3}}.{{H}_{2}}O\] weighing \[0.62\,\,g\]is added to \[100\,\,ml\] of \[0.1\,N\ \ {{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] solution. What will be the resulting solution                                       [BHU 1997]
  A)
                  Acidic    done clear
  B)
                  Neutral done clear
  C)
                  Basic      done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer63)
  The pH of the solution is 4. The hydrogen ion concentration of the solution in mol/litre is               [UPSEAT 2000]
  A)
                  9.5          done clear
  B)
                  \[{{10}^{-4}}\] done clear
  C)
                  \[{{10}^{4}}\]     done clear
  D)
                  \[{{10}^{-2}}\] done clear
  View Solution play_arrow

• question_answer64)
  \[NaO{{H}_{(aq)}},HC{{l}_{(aq)}}\] and \[NaC{{l}_{(aq)}}\] concentration of each is \[{{10}^{-3}}M\]. Their pH will be respectively       [BHU 2003]
  A)
                  10, 6, 2  done clear
  B)
                  11, 3, 7 done clear
  C)
                  10, 2, 6  done clear
  D)
                  3, 4, 7 done clear
  View Solution play_arrow

• question_answer65)
  The \[pH\] of \[{{10}^{-5}}\]M aqueous solution of \[NaOH\]is [MP PET 1996]
  A)
                  5              done clear
  B)
                  7 done clear
  C)
                  9              done clear
  D)
                  11 done clear
  View Solution play_arrow

• question_answer66)
  The \[pH\] of 0.05 M solution of dibasic acid is [MH CET 2002]
  A)
                  \[+1\]    done clear
  B)
                  \[-1\] done clear
  C)
                  \[+2\]    done clear
  D)
                  \[-2\] done clear
  View Solution play_arrow

• question_answer67)
  A buffer solution contains \[6.4\times {{10}^{-5}}\] of acetic acid and \[0.1\,\,M\] of sodium acetate. What will be its \[pH\], if \[p{{K}_{a}}\]of acetic acid is 4.75                                         [MP PMT 1996]
  A)
                  4.00        done clear
  B)
                  4.75 done clear
  C)
                  5.00        done clear
  D)
                  5.25 done clear
  View Solution play_arrow

• question_answer68)
  To obtain a buffer which should be suitable for maintaining a \[pH\]of about \[4-5,\] we need to have in solution, a mixture of
  A)
                  A strong base + its salt with a weak acid done clear
  B)
                  A weak base + its salt with a strong acid done clear
  C)
                  A strong acid + its salt with a weak base done clear
  D)
                  A weak acid + its salt with a strong base done clear
  View Solution play_arrow

• question_answer69)
  The concentration of \[NaOH\] solution is\[{{10}^{-8}}\,M.\] Find out the \[(O{{H}^{-}})\] concentration               [CPMT 1993]
  A)
                  \[{{10}^{-8}}\]   done clear
  B)
                  Greater than \[{{10}^{-6}}\] done clear
  C)
                  \[{{10}^{-6}}\] done clear
  D)
                  Lies between  \[{{10}^{-6}}\]and \[{{10}^{-7}}\] done clear
  View Solution play_arrow

• question_answer70)
  The \[pH\] of \[0.0001\,\,N\]solution of \[KOH\]will be [BHU 1997; CET Pune 1998]
  A)
                  4              done clear
  B)
                  6 done clear
  C)
                  10 done clear
  D)
                  12 done clear
  View Solution play_arrow

• question_answer71)
  Given that the dissociation constant for \[{{H}_{2}}O\] is \[{{K}_{w}}=1\times {{10}^{-14}}\] \[mol{{e}^{2}}\,\,litr{{e}^{-2}},\] what is the \[HCl\] of a \[0.001\,\,molar\,\,KOH\]solution [MP PET 1995; MP PET/PMT 1998]
  A)
                  \[{{10}^{-11}}\] done clear
  B)
                  3 done clear
  C)
                  14           done clear
  D)
                  11 done clear
  View Solution play_arrow

• question_answer72)
  An acidic buffer solution can be prepared by mixing solution of [MNR 1983]
  A)
                  Ammonium acetate and acetic acid done clear
  B)
                  Ammonium chloride and hydrochloric acid done clear
  C)
                  Sulphuric acid and sodium sulphate done clear
  D)
                  Acetic acid and sulphuric acid done clear
  E)
                  \[NaCl\] and \[NaOH\] done clear
  View Solution play_arrow

• question_answer73)
  Which of the following mixtures forms an acid buffer [MP PMT 1993; IIT 1981; CPMT 1989; CBSE PMT 1989]
  A)
                  \[NaOH+HCl\]   done clear
  B)
                  \[C{{H}_{3}}COOH+C{{H}_{3}}COONa\] done clear
  C)
                  \[N{{H}_{4}}OH+N{{H}_{4}}Cl\] done clear
  D)
                  \[{{H}_{2}}C{{O}_{3}}+{{(N{{H}_{4}})}_{2}}C{{O}_{3}}\] done clear
  View Solution play_arrow

• question_answer74)
  A buffer solution has equal volumes of \[0.2M\,N{{H}_{4}}OH\] and \[0.02M\,N{{H}_{4}}Cl\]. The \[p{{K}_{b}}\] of the base is 5. The pH is [CBSE PMT 1989; KCET 2005]
  A)
                  10           done clear
  B)
                  9 done clear
  C)
                  4              done clear
  D)
                  7 done clear
  View Solution play_arrow

• question_answer75)
  The \[pH\] of a simple sodium acetate buffer is given by \[pH=p{{K}_{a}}+\log \frac{[Salt]}{[Acid]}\]                 \[{{K}_{a}}\]of acetic acid \[=1.8\times {{10}^{-5}}\] If [Salt] = [Acid] = 0.1 M, the \[pH\]of the solution would be about           [BHU 1987]
  A)
                  7              done clear
  B)
                  4.7 done clear
  C)
                  5.3          done clear
  D)
                  1.4 done clear
  View Solution play_arrow

• question_answer76)
  Amongst the following solutions, the buffer solution is [MP PMT 1999]
  A)
                  \[N{{H}_{4}}Cl+N{{H}_{4}}OH\]solution done clear
  B)
                  \[N{{H}_{4}}Cl+NaOH\]solution done clear
  C)
                  \[N{{H}_{4}}OH+HCl\]solution done clear
  D)
                  \[NaOH+HCl\]solution done clear
  View Solution play_arrow

• question_answer77)
  The \[pH\] of solution having \[[O{{H}^{-}}]={{10}^{-7}}\] is         [AIIMS 1996]
  A)
                  7              done clear
  B)
                  14 done clear
  C)
                  Zero       done clear
  D)
                  \[-7\] done clear
  View Solution play_arrow

• question_answer78)
  \[50\,\,ml\] water is added to a \[50\,\,ml\] solution of \[Ba{{(OH)}_{2}}\] of strength \[0.01\,\,M.\] The \[pH\] value of the resulting solution will be               [MP PMT 1999]
  A)
                  8              done clear
  B)
                  10 done clear
  C)
                  12           done clear
  D)
                  6 done clear
  View Solution play_arrow

• question_answer79)
  \[pH\]of a solution can be expressed as [CPMT 1999; UPSEAT 2001]
  A)
                  \[-{{\log }_{e}}({{H}^{+}})\]         done clear
  B)
                  \[-{{\log }_{10}}({{H}^{+}})\] done clear
  C)
                  \[{{\log }_{e}}({{H}^{+}})\]           done clear
  D)
                  \[{{\log }_{10}}({{H}^{+}})\] done clear
  View Solution play_arrow

• question_answer80)
  The solution of sodium carbonate has pH             [MP PET 2000]
  A)
                  Greater than 7  done clear
  B)
                  Less than 7 done clear
  C)
                  Equal to 7            done clear
  D)
                  Equal to zero done clear
  View Solution play_arrow

• question_answer81)
  The \[pH\] of \[{{10}^{-7}}N\,HCl\] is      [RPMT 2000]
  A)
                  6.0          done clear
  B)
                  6.97 done clear
  C)
                  8.0          done clear
  D)
                  10.0 done clear
  View Solution play_arrow

• question_answer82)
  If the \[pH\] of a solution is 2, its normality will be [MADT Bihar 1982; MP PET 2000]
  A)
                  2N          done clear
  B)
                  \[\tfrac{1}{2}N\] done clear
  C)
                  0.01 N   done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer83)
  The buffer solution of 100 \[ml\] having a \[pH\] value 4 when added to 1 \[ml\] dilute \[HCl\], then the \[pH\] of buffer solution [NCERT 1976, 77]
  A)
                  Converts to 7     done clear
  B)
                  Does not change done clear
  C)
                  Converts to 2     done clear
  D)
                  Changes to 10 done clear
  View Solution play_arrow

• question_answer84)
  In a solution of acetic acid, sodium acetate is added, then its pH value    [NCERT 1977; DPMT 1985; MP PMT 1994]
  A)
                  Decreases           done clear
  B)
                  Increases done clear
  C)
                  Remains unchanged       done clear
  D)
                  A and B both are correct done clear
  View Solution play_arrow

• question_answer85)
  If pOH of a solution is 6.0, then its pH will be [MP PMT 1987]
  A)
                  6              done clear
  B)
                  10 done clear
  C)
                  8              done clear
  D)
                  14 done clear
  View Solution play_arrow

• question_answer86)
  In a solution of \[pH=5,\] more acid is added in order to reduce the \[pH=2.\] The increase in hydrogen ion concentration is                [MP PET 1989; CPMT 1990]
  A)
                  100 times             done clear
  B)
                  1000 times done clear
  C)
                  3 times done clear
  D)
                  5 times done clear
  View Solution play_arrow

• question_answer87)
  Which solution contains maximum number of \[{{H}^{+}}\]ion
  A)
                  0.1 M \[HCl\]      done clear
  B)
                  0.1 M \[N{{H}_{4}}Cl\] done clear
  C)
                  0.1 M \[NaHC{{O}_{3}}\]               done clear
  D)
                  0.1 M done clear
  View Solution play_arrow

• question_answer88)
  A certain buffer solution contains equal concentration of \[3.9\times {{10}^{-5}}\] and \[HX.\] The \[{{K}_{b}}\] for \[{{H}^{-}}\] is  \[{{10}^{-10}}.\] The \[pH\]of the buffer is [IIT 1984; RPMT 1997; CPMT 1996; DPMT 2004]
  A)
                  4              done clear
  B)
                  7 done clear
  C)
                  10           done clear
  D)
                  14 done clear
  View Solution play_arrow

• question_answer89)
  The defination of \[pH\]is            [EAMCET 1980; UPSEAT 2001]
  A)
                  \[pH=\log \frac{1}{[{{H}^{+}}]}\]               done clear
  B)
                  \[pH=\log \,[{{H}^{+}}]\] done clear
  C)
                  \[pH=-\log \frac{1}{[{{H}^{+}}]}\]             done clear
  D)
                  \[pH=-{{\log }^{[{{H}^{+}}]}}\] done clear
  View Solution play_arrow

• question_answer90)
  Which of the following does not make any change in \[pH\] when added to \[10\,\,ml\] dilute \[HCl\] [NCERT 1975]
  A)
                  5 ml pure water                done clear
  B)
                  20 ml pure water done clear
  C)
                  10 \[ml\,\,HCl\] done clear
  D)
                  Same 20 \[ml\]dilute \[HCl\] done clear
  View Solution play_arrow

• question_answer91)
  A compound whose aqueous solution will have the highest \[pH\] [CPMT 1974, 75, 78; MP PET 1996; DPMT 1982, 83]
  A)
                  \[NaCl\]               done clear
  B)
                  \[N{{a}_{2}}C{{O}_{3}}\] done clear
  C)
                  \[N{{H}_{4}}Cl\]                done clear
  D)
                  \[NaHC{{O}_{3}}\] done clear
  View Solution play_arrow

• question_answer92)
  At \[{{80}^{o}}C,\] distilled water has \[[{{H}_{3}}{{O}^{+}}]\] concentration equal to \[1\times {{10}^{-6}}\,\,mole/litre.\] The value of \[{{K}_{w}}\]at this temperature will be      [CBSE PMT 1994; RPMT 2000; AFMC 2001; AIIMS 2002; BHU 2002]
  A)
                  \[1\times {{10}^{-6}}\]   done clear
  B)
                  \[1\times {{10}^{-9}}\] done clear
  C)
                  \[1\times {{10}^{-12}}\]                done clear
  D)
                  \[{{K}_{SP}}\] done clear
  View Solution play_arrow

• question_answer93)
  The \[pH\] value of \[0.1\,\,M\,\,NaOH\] solution is (when there is a given reaction \[[{{H}^{+}}]\,[O{{H}^{-}}]={{10}^{-15}}\])   [CPMT 1997]
  A)
                  13           done clear
  B)
                  12 done clear
  C)
                  11           done clear
  D)
                  2 done clear
  View Solution play_arrow

• question_answer94)
  Which oxychloride has maximum \[pH\]               [CPMT 1997]
  A)
                  \[NaClO\]            done clear
  B)
                  \[NaCl{{O}_{2}}\] done clear
  C)
                  \[NaCl{{O}_{3}}\]             done clear
  D)
                  \[NaCl{{O}_{4}}\] done clear
  View Solution play_arrow

• question_answer95)
  \[pH\] of \[HCl\,({{10}^{-12}}M)\]is         [CPMT 1997; Pb. PET/PMT 1999]
  A)
                  12           done clear
  B)
                  \[-12\] done clear
  C)
                  \[\approx 7\]     done clear
  D)
                  14 done clear
  View Solution play_arrow

• question_answer96)
  Which one is buffer solution       [CPMT 1997]
  A)
                  \[[PO_{4}^{-}]\,\,[[HPO_{4}^{--}]\]         done clear
  B)
                  \[[PO_{3}^{3}]\,\,[[{{H}_{2}}PO_{4}^{-}]\] done clear
  C)
                  \[[HPO_{4}^{-}]\,\,[[{{H}_{2}}PO_{4}^{-}]\]         done clear
  D)
                  All of these done clear
  View Solution play_arrow

• question_answer97)
  When \[100\,\,ml\] of \[M/10\,\,NaOH\] solution and \[50\,\,ml\] of \[M/5\,\,HCl\] solution are mixed, the \[pH\] of resulting solution would be                                         [RPMT 1997]
  A)
                  0              done clear
  B)
                  7 done clear
  C)
                  Less than 7          done clear
  D)
                  More than 7 done clear
  View Solution play_arrow

• question_answer98)
  How many millilitres of \[6.0\,\,M\]hydrochloric acid should be used to prepare \[150\,\,ml\] of a solution which is \[0.30\,\,M\] in hydrogen ion                                     [Pb. PMT 1998]
  A)
                  3.0          done clear
  B)
                  7.5 done clear
  C)
                  9.3          done clear
  D)
                  30 done clear
  View Solution play_arrow

• question_answer99)
  The pH of 0.1 M acetic acid is 3, the dissociation constant of acid will be
  A)
                  \[1.0\times {{10}^{-4}}\]               done clear
  B)
                  \[1.0\times {{10}^{-5}}\] done clear
  C)
                  \[1.0\times {{10}^{-3}}\]               done clear
  D)
                  \[1.0\times {{10}^{-8}}\] done clear
  View Solution play_arrow

• question_answer100)
  The \[pH\] of a buffer solution containing \[25\,ml\]of \[1\,M\,C{{H}_{3}}COONa\] and \[25\,\,ml\] of \[1\,\,M\,\,C{{H}_{3}}COOH\] will be appreciably affected by \[5\,\,ml\] of                         [CPMT 1987]
  A)
                  \[1\,\,M\,\,C{{H}_{3}}COOH\]    done clear
  B)
                  \[5\,\,M\,\,C{{H}_{3}}COOH\] done clear
  C)
                  \[5\,\,M\,\,HCl\]              done clear
  D)
                  \[1\,\,M\,\,N{{H}_{4}}OH\] done clear
  View Solution play_arrow

• question_answer101)
  The \[pH\]value of decinormal solution of \[N{{H}_{4}}OH\] which is 20% ionised, is        [CBSE PMT 1998]
  A)
                  13.30     done clear
  B)
                  14.70 done clear
  C)
                  12.30     done clear
  D)
                  12.95 done clear
  View Solution play_arrow

• question_answer102)
  A physician wishes to prepare a buffer solution at \[pH=3.58\] that efficiently resists changes in \[pH\] yet contains only small concentration of the buffering agents. Which of the following weak acids together with its sodium salt would be best to use   [CBSE PMT 1997]
  A)
                  \[m-\]chlorobenzoic acid \[(p{{K}_{a}}=3.98)\] done clear
  B)
                  \[p-\]chlorocinnamic acid \[(p{{K}_{a}}=4.41)\] done clear
  C)
                  \[2,\,\,5-\]dihydroxy benzoic acid \[(p{{K}_{a}}=2.97)\] done clear
  D)
                  Acetoacetic acid \[(p{{K}_{a}}=3.58)\] done clear
  View Solution play_arrow

• question_answer103)
  In a mixture of a weak acid and its salt, the ratio of concentration of acid to salt is increased ten-fold. The \[pH\] of the solution                                                [KCET 1996]
  A)
                  Decreases by one            done clear
  B)
                  Increases by one-tenth done clear
  C)
                  Increases by one              done clear
  D)
                  Increases ten-fold done clear
  View Solution play_arrow

• question_answer104)
  When an acid or alkali is mixed with buffer solution, then \[pH\]of buffer solution            [CPMT 1997]
  A)
                  Not changes       done clear
  B)
                  Changes slightly done clear
  C)
                  Increases             done clear
  D)
                  Decreases done clear
  View Solution play_arrow

• question_answer105)
  How much sodium acetate should be added to a \[0.1\,\,m\] solution of \[C{{H}_{3}}COOH\] to give a solution of \[pH=5.5\,(p{{K}_{a}}\] of \[C{{H}_{3}}COOH=4.5)\]        [KCET 1996]
  A)
                  \[0.1\,\,m\]        done clear
  B)
                  \[0.2\,\,m\] done clear
  C)
                  \[1.0\,\,m\]        done clear
  D)
                  \[10.0\,\,m\] done clear
  View Solution play_arrow

• question_answer106)
  The \[pH\] of the aqueous solution containing \[0.49\,\,gm\]of \[{{H}_{2}}S{{O}_{4}}\] in one litre is       [EAMCET 1997]
  A)
                  2              done clear
  B)
                  1 done clear
  C)
                  1.7          done clear
  D)
                  0.3 done clear
  View Solution play_arrow

• question_answer107)
  Which of the following solutions can act as buffer [JIPMER 1997]
  A)
                  0.1 molar aq. \[NaCl\] done clear
  B)
                  0.1 molar aq. \[C{{H}_{3}}COOH+0.1\]molar \[NaOH\] done clear
  C)
                  0.1 molar aq. ammonium acetate done clear
  D)
                  None of the above done clear
  View Solution play_arrow

• question_answer108)
  The \[pH\] of a solution obtained by mixing \[50\,\,ml\] of \[0.4\,\,N\,\,HCl\] and \[50\,\,ml\] of \[0.2\,\,N\,\,NaOH\]is                 [KCET 1996]
  A)
                  \[-\log 2\]            done clear
  B)
                  \[-\log 0.2\] done clear
  C)
                  1.0          done clear
  D)
                  2.0 done clear
  View Solution play_arrow

• question_answer109)
  Which of the following is a buffer [MP PMT 1991; BHU 1995]
  A)
                  \[NaOH+C{{H}_{3}}COONa\] done clear
  B)
                  \[NaOH+N{{a}_{2}}S{{O}_{4}}\] done clear
  C)
                  \[1\times {{10}^{-4}}\] done clear
  D)
                  \[N{{H}_{4}}OH+C{{H}_{3}}COON{{H}_{4}}\] done clear
  View Solution play_arrow

• question_answer110)
  If 4.0 gm \[NaOH\] is present in 1 litre solution, then its \[pH\] will be     [CPMT 1989]
  A)
                  6              done clear
  B)
                  13 done clear
  C)
                  18           done clear
  D)
                  24 done clear
  View Solution play_arrow

• question_answer111)
  The \[pOH\]of beer is 10.0. The hydrogen ion concentration will be                                         [MP PMT 1994]
  A)
                  \[{{10}^{-2}}\]   done clear
  B)
                  \[{{10}^{-10}}\] done clear
  C)
                  \[{{10}^{-8}}\]   done clear
  D)
                  \[{{10}^{-4}}\] done clear
  View Solution play_arrow

• question_answer112)
  When a buffer solution of sodium acetate and acetic acid is diluted with water   [CPMT 1985]
  A)
                  Acetate ion concentration increases done clear
  B)
                  \[{{H}^{+}}\]ion concentration increases done clear
  C)
                  \[O{{H}^{-}}\]ion concentration increases done clear
  D)
                  \[{{H}^{+}}\]ion concentration remain unaltered done clear
  View Solution play_arrow

• question_answer113)
  What is the \[pH\]of \[Ba{{(OH)}_{2}}\]if normality is 10 [CPMT 1996]
  A)
                  4              done clear
  B)
                  10 done clear
  C)
                  7              done clear
  D)
                  9 done clear
  View Solution play_arrow

• question_answer114)
  What will be the \[pH\] of a solution formed by mixing \[40\,\,ml\] of \[0.10\,\,M\,\,HCl\] with \[10\,\,ml\] of \[0.45\,\,M\,\,NaOH\] [Manipal MEE 1995]
  A)
                  12           done clear
  B)
                  10 done clear
  C)
                  8              done clear
  D)
                  6 done clear
  View Solution play_arrow

• question_answer115)
  The \[pH\] of a solution having \[[{{H}^{+}}]=10\times {{10}^{-4}}\,\,moles/litre\] will be              [BHU 1981]
  A)
                  1 done clear
  B)
                  2 done clear
  C)
                  3              done clear
  D)
                  4 done clear
  View Solution play_arrow

• question_answer116)
  If  \[0.4\,gm\,\,NaOH\] is present in 1 litre solution, then its \[pH\] will be                             [CPMT 1985; BHU 1980]
  A)
                  2              done clear
  B)
                  10 done clear
  C)
                  11           done clear
  D)
                  12 done clear
  View Solution play_arrow

• question_answer117)
  Which of the following is not a Bronsted acid      [BHU 1997]
  A)
                  \[C{{H}_{3}}NH_{4}^{+}\]             done clear
  B)
                  \[C{{H}_{3}}CO{{O}^{-}}\] done clear
  C)
                  \[{{H}_{2}}O\]   done clear
  D)
                  \[HSO_{4}^{-}\] done clear
  View Solution play_arrow

• question_answer118)
  \[pH\]of 0.005 \[M\,\,{{H}_{2}}S{{O}_{4}}\] solution will be          [NCERT 1980]
  A)
                  0.005     done clear
  B)
                  2 done clear
  C)
                  1              done clear
  D)
                  0.01 done clear
  View Solution play_arrow

• question_answer119)
  A buffer solution is a mixture of                [MP PMT 1987]
  A)
                  Strong acid and  strong base done clear
  B)
                  Weak acid and weak base done clear
  C)
                  Weak acid and conjugate acid done clear
  D)
                  Weak acid and conjugate base done clear
  View Solution play_arrow

• question_answer120)
  When \[pH\] of a solution decreases, its hydrogen ion concentration                                      [MADT Bihar 1981]
  A)
                  Decreases           done clear
  B)
                  Increases done clear
  C)
                  Rapidly increases             done clear
  D)
                  Remains always constant done clear
  View Solution play_arrow

• question_answer121)
  If the \[pH\] of a solution is 4.0 at \[{{25}^{o}}C,\] its \[pOH\] would be \[({{K}_{w}}={{10}^{-14}})\]         [MP PMT 1989]
  A)
                  4.0          done clear
  B)
                  6.0 done clear
  C)
                  8.0          done clear
  D)
                  10.0 done clear
  View Solution play_arrow

• question_answer122)
  An aqueous solution whose \[O{{H}^{-}}\] is [CPMT 1976; DPMT 1982]
  A)
                  Alkaline                done clear
  B)
                  Acidic done clear
  C)
                  Neutral done clear
  D)
                  Amphoteric done clear
  View Solution play_arrow

• question_answer123)
  In a solution of acid \[{{H}^{+}}\]concentration is \[{{10}^{-10}}M.\] The pH of this solution will be
  A)
                  8              done clear
  B)
                  6 done clear
  C)
                  Between 6 and 7              done clear
  D)
                  Between 3 and 6 done clear
  View Solution play_arrow

• question_answer124)
  The concentration of hydronium \[({{H}_{3}}{{O}^{+}})\] ion in water is [CET Pune 1998]
  A)
                  Zero       done clear
  B)
                  \[1\times {{10}^{7}}\,gm\,\,ion/litre\] done clear
  C)
                  \[1\times {{10}^{-14}}\,gm\,\,ion/litre\]                done clear
  D)
                  \[1\times {{10}^{-7}}\,gm\,\,ion/litre\] done clear
  View Solution play_arrow

• question_answer125)
  A solution whose pH value is less than 7 will be
  A)
                  Basic      done clear
  B)
                  Acidic done clear
  C)
                  Neutral done clear
  D)
                  Buffer done clear
  View Solution play_arrow

• question_answer126)
  When the \[pH\]of a solution is 2, the hydrogen ion concentration in moles per litre is [NCERT 1973; MNR 1979]
  A)
                  \[1\times {{10}^{-14}}\]                done clear
  B)
                  \[1\times {{10}^{-2}}\] done clear
  C)
                  \[1\times {{10}^{-7}}\]   done clear
  D)
                  \[pH\] done clear
  View Solution play_arrow

• question_answer127)
  A base is dissolved in water yields a solution with a hydroxide ion concentration of 0.05 \[mol\,\,litr{{e}^{-1}}.\] The solution is            [AFMC 1997]
  A)
                  Basic      done clear
  B)
                  Acid done clear
  C)
                  Neutral done clear
  D)
                  Both A and B done clear
  View Solution play_arrow

• question_answer128)
  The \[pH\]of a solution is increased from 3 to 6. Its \[{{H}^{+}}\]ion concentration will be              [EAMCET 1998]
  A)
                  Reduced to half done clear
  B)
                  Doubled done clear
  C)
                  Reduced by 1000 times done clear
  D)
                  Increased by 1000 times done clear
  View Solution play_arrow

• question_answer129)
  Pure water is kept in a vessel and it remains exposed to atmospheric \[C{{O}_{2}}\]which is absorbed, then its pH will be [MADT Bihar 1984; DPMT 2002]
  A)
                  Greater than 7 done clear
  B)
                  Less than 7 done clear
  C)
                  7 done clear
  D)
                  Depends on ionic product of water done clear
  View Solution play_arrow

• question_answer130)
  The \[pH\]of a solution is 2. If its \[pH\] is to be raised to 4, then the \[[{{H}^{+}}]\] of the original solution has to be       [MP PET 1994]
  A)
                  Doubled done clear
  B)
                  Halved done clear
  C)
                  Increased hundred times done clear
  D)
                  Decreased hundred times done clear
  View Solution play_arrow

• question_answer131)
  Which of the following solutions cannot act as a buffer [EAMCET 1998]
  A)
                  \[Na{{H}_{2}}P{{O}_{4}}+{{H}_{3}}P{{O}_{4}}\] done clear
  B)
                  \[C{{H}_{3}}COOH+C{{H}_{3}}COONa\] done clear
  C)
                  \[HCl+N{{H}_{4}}Cl\] done clear
  D)
                  \[{{H}_{3}}P{{O}_{4}}+N{{a}_{2}}HP{{O}_{4}}\] done clear
  View Solution play_arrow

• question_answer132)
  Assuming complete ionisation, the \[pH\] of \[0.1\,M\,\,HCl\]is 1. The molarity of \[{{H}_{2}}S{{O}_{4}}\] with the same \[pH\] is [KCET 1998]
  A)
                  0.2          done clear
  B)
                  0.1 done clear
  C)
                  2.0          done clear
  D)
                  0.05 done clear
  View Solution play_arrow

• question_answer133)
  The \[pH\]of blood is
  A)
                  5.2          done clear
  B)
                  6.3 done clear
  C)
                  7.4          done clear
  D)
                  8.5 done clear
  View Solution play_arrow

• question_answer134)
  The pH of \[{{10}^{-8}}\]molar aqueous solution of \[HCl\]is [CPMT 1988; MNR 1983, 90; MP PMT 1987; IIT 1981; BHU 1995; AFMC 1998; MP PET 1989, 99; BCECE 2005]
  A)
                  \[-8\] done clear
  B)
                  8 done clear
  C)
                  \[6>7\] (Between 6 and 7) done clear
  D)
                  \[7>8\] (Between 7 and 8) done clear
  View Solution play_arrow

• question_answer135)
  As the temperature increases, the \[pH\] of a \[KOH\] solution [UPSEAT 2001]
  A)
                  Will decreases done clear
  B)
                  Will increases done clear
  C)
                  Remains constant done clear
  D)
                  Depends upon concentration of \[KOH\] solution done clear
  View Solution play_arrow

• question_answer136)
  The hydrogen ion concentration in a given solution is \[6\times {{10}^{-4}}.\] Its \[pH\] will be    [EAMCET 1978]
  A)
                  6              done clear
  B)
                  4 done clear
  C)
                  3.22        done clear
  D)
                  2 done clear
  View Solution play_arrow

• question_answer137)
  The \[pH\] of \[\frac{N}{100}\]HCl  would be approximately [CPMT 1971; DPMT 1982, 83; MP PMT 1991; Bihar MEE 1996]
  A)
                  1              done clear
  B)
                  1.5 done clear
  C)
                  2              done clear
  D)
                  2.5 done clear
  View Solution play_arrow

• question_answer138)
  A solution which is resistant to change of \[HF\] upon the addition of an acid or a base is known as           [BHU 1979]
  A)
                  A colloid               done clear
  B)
                  A crystalloid done clear
  C)
                  A buffer               done clear
  D)
                  An indicator done clear
  View Solution play_arrow

• question_answer139)
  \[{{10}^{-6}}M\,\,HCl\] is diluted to 100 times. Its \[pH\]is [CPMT 1984]
  A)
                  6.0          done clear
  B)
                  8.0 done clear
  C)
                  6.95 done clear
  D)
                  9.5 done clear
  View Solution play_arrow

• question_answer140)
  The \[pH\] of a \[{{10}^{-10}}\] molar \[HCl\] solution is approximately [NCERT 1977]
  A)
                  10           done clear
  B)
                  7 done clear
  C)
                  1              done clear
  D)
                  14 done clear
  View Solution play_arrow

• question_answer141)
  The \[{{H}^{+}}\]ion concentration is \[1.0\times {{10}^{-6}}\] mole/litre in a solution. Its pH value will be [MP PMT 1985; AFMC 1982]
  A)
                  12           done clear
  B)
                  6 done clear
  C)
                  18           done clear
  D)
                  24 done clear
  View Solution play_arrow

• question_answer142)
  The \[pH\]of a solution is the negative logarithm to the base 10 of its hydrogen ion concentration in [Manipal MEE 1995]
  A)
                  Moles per litre  done clear
  B)
                  Millimoles per litre done clear
  C)
                  Micromoles per litre       done clear
  D)
                  Nanomoles per litre done clear
  View Solution play_arrow

• question_answer143)
  When \[{{10}^{-8}}\]mole of \[HCl\] is dissolved in one litre of water, the \[pH\]of the solution will be [CPMT 1973, 94; DPMT 1982]
  A)
                  8              done clear
  B)
                  7 done clear
  C)
                  Above 8               done clear
  D)
                  Below 7 done clear
  View Solution play_arrow

• question_answer144)
  The \[pH\] of the solution containing 10 \[ml\]of 0.1 N  \[NaOH\] and 10 \[ml\] of 0.05 N \[{{H}_{2}}S{{O}_{4}}\] would be [CPMT 1987; Pb. PMT 2002,04]
  A)
                  0              done clear
  B)
                  1 done clear
  C)
                  > 7          done clear
  D)
                  7 done clear
  View Solution play_arrow

• question_answer145)
  The \[pH\] of 0.001 molar solution of \[HCl\] will be  [MP PET 1986; MP PET/PMT 1988; CBSE PMT 1991]
  A)
                  0.001     done clear
  B)
                  3 done clear
  C)
                  2              done clear
  D)
                  6 done clear
  View Solution play_arrow

• question_answer146)
  Which salt can be classified as an acid salt             [CPMT 1989]
  A)
                  \[N{{a}_{2}}S{{O}_{4}}\]               done clear
  B)
                  \[BiOCl\] done clear
  C)
                  \[Pb(OH)Cl\]      done clear
  D)
                  \[N{{a}_{2}}HP{{O}_{4}}\] done clear
  View Solution play_arrow

• question_answer147)
  Given a 0.1M solution of each of the following. Which solution has the lowest \[pH\]      [MNR 1987]
  A)
                  \[NaHS{{O}_{4}}\]           done clear
  B)
                  \[N{{H}_{4}}Cl\] done clear
  C)
                  \[HCl\]  done clear
  D)
                  \[N{{H}_{3}}\] done clear
  View Solution play_arrow

• question_answer148)
  Out of the following, which pair of solutions is not a buffer solution
  A)
                  \[N{{H}_{4}}Cl+N{{H}_{4}}OH\] done clear
  B)
                  \[NaCl+NaOH\] done clear
  C)
                  \[N{{a}_{2}}HP{{O}_{4}}+N{{a}_{3}}P{{O}_{4}}\] done clear
  D)
                  \[C{{H}_{3}}COOH+C{{H}_{3}}COONa\] done clear
  View Solution play_arrow

• question_answer149)
  If the dissociation constant of an acid HA is \[1\times {{10}^{-5}},\] the \[pH\] of a 0.1 molar solution of the acid will be approximately   [NCERT 1979]
  A)
                  Three    done clear
  B)
                  Five done clear
  C)
                  One       done clear
  D)
                  Six done clear
  View Solution play_arrow

• question_answer150)
  \[pH\] value of \[N/10\,\,NaOH\] solution is [CBSE PMT 1996;Pb. CET 2001; Pb. PMT 2002]
  A)
                  10           done clear
  B)
                  11 done clear
  C)
                  12           done clear
  D)
                  13 done clear
  View Solution play_arrow

• question_answer151)
  A solution of sodium borate has a \[pH\] of approximately  [JIPMER 2001]
  A)
                  < 7 done clear
  B)
                  > 7 done clear
  C)
                  = 7          done clear
  D)
                  Between 4 to 5 done clear
  View Solution play_arrow

• question_answer152)
  If \[pH\]of \[A,\,\,B,\,\,C\]and \[D\]are 9.5, 2.5, 3.5 and 5.5 respectively, then strongest acid is  [AFMC 1995]
  A)
                  A             done clear
  B)
                  C done clear
  C)
                  D             done clear
  D)
                  B done clear
  View Solution play_arrow

• question_answer153)
  At \[25{}^\circ C\] the \[pH\] value of a solution is 6. The solution is [AFMC 2001]
  A)
                  Basic      done clear
  B)
                  Acidic done clear
  C)
                  Neutral done clear
  D)
                  Both B and C done clear
  View Solution play_arrow

• question_answer154)
  A certain buffer solution contains equal concentration of \[{{X}^{-}}\] and \[HX\]. The \[{{K}_{a}}\] for HX is \[{{10}^{-8}}\]. The \[pH\] of the buffer is [UPSEAT 2001]
  A)
                  3              done clear
  B)
                  8 done clear
  C)
                  11           done clear
  D)
                  14 done clear
  View Solution play_arrow

• question_answer155)
  The dissociation constant of HCN is \[5\times {{10}^{-10}}\]. The \[pH\] of the solution prepared by mixing 1.5 mole of HCN and 0.15 moles of KCN in water and making up the total volume to \[0.5\,d{{m}^{3}}\] is                                               [JIPMER 2001]
  A)
                  7.302     done clear
  B)
                  9.302 done clear
  C)
                  8.302     done clear
  D)
                  10.302 done clear
  View Solution play_arrow

• question_answer156)
  Which buffer solution out of the following will have \[pH>7\]     [MP PET 2001]
  A)
                  \[C{{H}_{3}}COOH+C{{H}_{3}}COONa\] done clear
  B)
                  \[HCOOH+HCOOK\] done clear
  C)
                  \[C{{H}_{3}}COON{{H}_{4}}\] done clear
  D)
                  \[N{{H}_{4}}OH+N{{H}_{4}}Cl\] done clear
  View Solution play_arrow

• question_answer157)
  The \[p{{K}_{a}}\] of equimolecular sodium acetate and acetic acid mixture is 4.74. If \[pH\] is    [DPMT 2001]
  A)
                  7              done clear
  B)
                  9.2 done clear
  C)
                  4.74        done clear
  D)
                  14 done clear
  View Solution play_arrow

• question_answer158)
  \[pH\] of \[NaCl\]solution is        [CET Pune 1998]
  A)
                  7              done clear
  B)
                  Zero done clear
  C)
                  \[>7\]    done clear
  D)
                  \[<7\] done clear
  View Solution play_arrow

• question_answer159)
  A solution of sodium chloride in contact with atmosphere has a \[pH\]of about  [NCERT 1972, 77]
  A)
                  3.5          done clear
  B)
                  5 done clear
  C)
                  7              done clear
  D)
                  1.4 done clear
  View Solution play_arrow

• question_answer160)
  Which would decrease the \[pH\] of \[25\,c{{m}^{3}}\] of a \[0.01\,M\] solution of hydrochloric acid       [MH CET 2001]
  A)
                  The addition of \[25\,c{{m}^{3}}\] \[0.005\,M\] hydrochloric acid done clear
  B)
                  The addition of \[25\,c{{m}^{3}}\] of \[0.02\,M\] hydrochloric acid done clear
  C)
                  The addition of magnesium metal done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer161)
  The condition for minimum change in \[pH\] for a buffer solution is                                         [RPMT 2000]
  A)
                  Isoelectronic species are added done clear
  B)
                  Conjugate acid or base is added done clear
  C)
                  \[pH=p{{K}_{a}}\] done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer162)
  A buffer solution with \[pH\]9 is to be prepared by mixing \[N{{H}_{4}}Cl\] and \[N{{H}_{4}}OH\]. Calculate the number of moles of \[N{{H}_{4}}Cl\] that should be added to one litre of \[1.0\,M\ N{{H}_{4}}OH.\,\] \[[{{K}_{b}}=1.8\times {{10}^{-5}}]\]     [UPSEAT 2001]
  A)
                  3.4          done clear
  B)
                  2.6 done clear
  C)
                  1.5          done clear
  D)
                  1.8 done clear
  View Solution play_arrow

• question_answer163)
  The ionization constant of a certain weak acid is \[{{10}^{-4}}\]. What should be the [salt] to [acid] ratio if we have to prepare a buffer with pH = 5 using this acid and one of the salts                 [CPMT 2000; KCET 2000; Pb. CET 2000]
  A)
                  \[1:10\]                done clear
  B)
                  \[10:1\] done clear
  C)
                  \[5:4\]   done clear
  D)
                  \[4:5\] done clear
  View Solution play_arrow

• question_answer164)
  Which solution has the highest pH value               [JIPMER 2000]
  A)
                  \[1\,M\,KOH\] done clear
  B)
                  \[1\,M\,{{H}_{2}}S{{O}_{4}}\] done clear
  C)
                  Chlorine water done clear
  D)
                  Water containing carbon dioxide done clear
  View Solution play_arrow

• question_answer165)
  One weak acid (like\[C{{H}_{3}}COOH\]) and its strong base together with salt (like \[C{{H}_{3}}COONa\]) is a buffer solution. In which pair this type of characteristic is found [AIIMS 1982; CPMT 1994; MP PET 1994]
  A)
                  \[pH\] and \[NaCl\]         done clear
  B)
                  \[NaOH\] and \[NaN{{O}_{3}}\] done clear
  C)
                  \[KOH\] and \[KCl\]        done clear
  D)
                  \[N{{H}_{4}}OH\] and \[N{{H}_{4}}Cl\] done clear
  View Solution play_arrow

• question_answer166)
  If the pH of a solution of an alkali metal hydroxide is 13.6, the concentration of hydroxide is         [JIPMER 2000]
  A)
                  Between 0.1 M and 1 M done clear
  B)
                  More than 1 M done clear
  C)
                  Less than 0.001 M done clear
  D)
                  Between 0.01 M and 1 M done clear
  View Solution play_arrow

• question_answer167)
  The \[p{{K}_{a}}\] of acetylsalicylic acid (aspirin) is 3.5. The \[pH\] of gastric juice in human stomach is about 2-3 and the \[pH\] in the small intestine is about 8. Aspirin will be [IIT 1988; KCET 2003]
  A)
                  Unionized in the small intestine and in the stomach done clear
  B)
                  Completely ionized in the small intestine and in the stomach done clear
  C)
                  Ionized in the stomach and almost unionized in the small intestine done clear
  D)
                  Ionized in the small intestine and almost unionized in the stomach done clear
  View Solution play_arrow

• question_answer168)
  The concentration of hydrogen ion in water is [MP PET 1990]
  A)
                  8              done clear
  B)
                  \[1\times {{10}^{-7}}\] done clear
  C)
                  7              done clear
  D)
                  \[1/7\] done clear
  View Solution play_arrow

• question_answer169)
  \[pH\]of a 10 \[M\] solution of \[HCl\] is               [CBSE PMT 1995]
  A)
                  Less than 0          done clear
  B)
                  2 done clear
  C)
                  0              done clear
  D)
                  1 done clear
  View Solution play_arrow

• question_answer170)
  The \[pH\] of  \[1\,\,N\,\,{{H}_{2}}O\] is               [CPMT 1988]
  A)
                  7              done clear
  B)
                  >7 done clear
  C)
                  <7           done clear
  D)
                  0 done clear
  View Solution play_arrow

• question_answer171)
  If \[{{H}^{+}}\]ion concentration of a solution is increased by 10 times its pH will be                                         [DCE 2000]
  A)
                  Increase by one                done clear
  B)
                  Remains unchanged done clear
  C)
                  Decrease by one              done clear
  D)
                  Increase by 10 done clear
  View Solution play_arrow

• question_answer172)
  The gastric juice in our stomach contains enough \[HCl\] to make the hydrogen ion concentration about \[0.01\,\,mole/litre.\] The \[pH\]of gastric juice is            [NCERT 1974]
  A)
                  0.01        done clear
  B)
                  1 done clear
  C)
                  2              done clear
  D)
                  14 done clear
  View Solution play_arrow

• question_answer173)
  Addition of which chemical will decrease the hydrogen ion concentration of an acetic acid solution [MP PMT 1990]
  A)
                  \[N{{H}_{4}}Cl\]                done clear
  B)
                  \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] done clear
  C)
                  \[AgN{{O}_{3}}\]              done clear
  D)
                  \[HCN\] done clear
  View Solution play_arrow

• question_answer174)
  The one which has the highest value of \[pH\]is
  A)
                  Distilled water   done clear
  B)
                  \[N{{H}_{3}}\]Solution in water done clear
  C)
                  \[N{{H}_{3}}\] done clear
  D)
                  Water saturated with \[C{{l}_{2}}\] done clear
  View Solution play_arrow

• question_answer175)
  The solution of \[N{{a}_{2}}C{{O}_{3}}\] has \[pH\]          [AMU 1988]
  A)
                  Greater than 7  done clear
  B)
                  Less than 7 done clear
  C)
                  Equal to 7            done clear
  D)
                  Equal to zero done clear
  View Solution play_arrow

• question_answer176)
  Which is not a buffer solution     [CPMT 1990]
  A)
                  \[N{{H}_{4}}Cl+N{{H}_{4}}OH\] done clear
  B)
                  \[C{{H}_{3}}COOH+C{{H}_{3}}COONa\] done clear
  C)
                  \[C{{H}_{3}}COON{{H}_{4}}\] done clear
  D)
                  Borax + Boric acid done clear
  View Solution play_arrow

• question_answer177)
  What will be hydrogen ion concentration in moles \[litr{{e}^{-1}}\] of a solution, whose \[pH\] is 4.58     [UPSEAT 2001]
  A)
                  \[2.63\times {{10}^{-5}}\] done clear
  B)
                  \[3.0\times {{10}^{-5}}\] done clear
  C)
                  \[4.68\] done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer178)
  Assuming complete dissociation, the \[pH\] of a 0.01 M \[NaOH\]solution is equal to [NCERT 1975; CPMT 1977; DPMT 1982; BHU 1997]
  A)
                  2.0          done clear
  B)
                  14.0 done clear
  C)
                  12.0        done clear
  D)
                  0.01 done clear
  View Solution play_arrow

• question_answer179)
  50 \[ml\] of \[2\,N\]acetic acid mixed with \[10\,ml\] of \[1\,\,N\]sodium acetate solution will have an approximate \[pH\] of [MP PMT/PET 1988]
  A)
                  4              done clear
  B)
                  5 done clear
  C)
                  6              done clear
  D)
                  7 done clear
  View Solution play_arrow

• question_answer180)
  The hydrogen ion concentration of 0.001 \[M\,\,NaOH\] solution is                                         [AFMC 1983]
  A)
                  \[1\times {{10}^{-2}}mole/litre\]              done clear
  B)
                   \[1\times {{10}^{-11}}mole/litre\] done clear
  C)
                  \[1\times {{10}^{-14}}mole/litre\]            done clear
  D)
                  \[1\times {{10}^{-12}}mole/litre\] done clear
  View Solution play_arrow

• question_answer181)
  A weak monoprotic acid of 0.1 M, ionizes to 1% in solution. What will be the pH of solution          [MNR 1988]
  A)
                  1              done clear
  B)
                  2 done clear
  C)
                  3              done clear
  D)
                  11 done clear
  View Solution play_arrow

• question_answer182)
  \[{{H}_{4}}{{O}^{+}}\]of a solution is 4. The hydroxide ion concentration of the solution would be [NCERT 1981; CBSE PMT 1991; MP PMT 1994]
  A)
                  \[{{10}^{-4}}\]   done clear
  B)
                  \[{{10}^{-10}}\] done clear
  C)
                  \[{{10}^{-2}}\]   done clear
  D)
                  \[{{10}^{-12}}\] done clear
  View Solution play_arrow

• question_answer183)
  The \[pH\] of an aqueous solution containing \[[{{H}^{+}}]=3\times {{10}^{-3}}M\] is                                      [MP PET 2001,04]
  A)
                  2.471     done clear
  B)
                  2.523 done clear
  C)
                  3.0          done clear
  D)
                  ? 3 done clear
  View Solution play_arrow

• question_answer184)
  \[pH\] of blood is maintained constant by mechanism of [MH CET 2002]
  A)
                  Common ion effect         done clear
  B)
                  Buffer done clear
  C)
                  Solubility              done clear
  D)
                  All of these done clear
  View Solution play_arrow

• question_answer185)
  The pH of normal KOH is               [MP PET 1990]
  A)
                  1              done clear
  B)
                  0 done clear
  C)
                  14           done clear
  D)
                  7 done clear
  View Solution play_arrow

• question_answer186)
  The concentration of hydrogen ion \[[{{H}^{+}}]\] in 0.01 M  \[HCl\] is [EAMCET 1979]
  A)
                  \[{{10}^{12}}\]   done clear
  B)
                  \[{{10}^{-2}}\] done clear
  C)
                  \[{{10}^{-1}}\]   done clear
  D)
                  \[{{10}^{-12}}\] done clear
  View Solution play_arrow

• question_answer187)
  A solution of weak acids is diluted by adding an equal volume of water. Which of the following will not change [JIPMER 1997]
  A)
                  Strength of the acid done clear
  B)
                  The value of \[[{{H}_{3}}{{O}^{+}}]\] done clear
  C)
                  \[pH\]of the solution done clear
  D)
                  The degree of dissociation of acid done clear
  View Solution play_arrow

• question_answer188)
  \[Ka\]of \[{{H}_{2}}{{O}_{2}}\]is of the order of                 [DCE 2004]
  A)
                  \[{{10}^{-12}}\] done clear
  B)
                  \[{{10}^{-14}}\] done clear
  C)
                  \[{{10}^{-16}}\] done clear
  D)
                  \[{{10}^{-10}}\] done clear
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• question_answer189)
  Equivalent weight of an acid       [UPSEAT 2004]
  A)
                  Depends on the reaction involved done clear
  B)
                  Depends upon the number of oxygen atoms present done clear
  C)
                  Is always same done clear
  D)
                  None of the above done clear
  View Solution play_arrow

• question_answer190)
  \[pH\]scale was introduced by   [UPSEAT 2004]
  A)
                  Arrhenius            done clear
  B)
                  Sorensen done clear
  C)
                  Lewis     done clear
  D)
                  Lowry done clear
  View Solution play_arrow

• question_answer191)
  Buffer solution is prepared by mixing     [MH CET 2003]
  A)
                  Strong acid + its salt of strong base done clear
  B)
                  Weak acid + its salt of weak base done clear
  C)
                  Strong acid + its salt of weak base done clear
  D)
                  Weak acid + its salt of strong base done clear
  View Solution play_arrow

• question_answer192)
  The pH of millimolar HCl is            [MH CET 2004]
  A)
                  1              done clear
  B)
                  3 done clear
  C)
                  2              done clear
  D)
                  4 done clear
  View Solution play_arrow

• question_answer193)
  Which of the following is a Lewis base    [CPMT 2004]
  A)
                  NaOH    done clear
  B)
                  \[N{{H}_{3}}\] done clear
  C)
                  \[BC{{l}_{3}}\]   done clear
  D)
                  All of these done clear
  View Solution play_arrow

• question_answer194)
  What will be the \[pH\]value of 0.05 M \[Ba{{(OH)}_{2}}\]solution [CPMT 2004]
  A)
                  12           done clear
  B)
                  13 done clear
  C)
                  1              done clear
  D)
                  12.96 done clear
  View Solution play_arrow

• question_answer195)
  In a mixing of acetic acid and sodium acetate the ratio of concentration of the salts to the acid is increased ten times. Then the pH of the solution    [KCET 2004]
  A)
                  Increase by one                done clear
  B)
                  Decreases by one  done clear
  C)
                  Decrease ten fold            done clear
  D)
                  Increases ten fold done clear
  View Solution play_arrow

• question_answer196)
  The rapid change of pH near the stoichiometric point of an acid-base titration is the basis of indicator detection. pH of the solution is related to ratio of the concentrations of the conjugate acid (HIn) and base \[(I{{n}^{-}})\]forms of the indicator by the expression                                            [CBSE PMT 2004]
  A)
                  \[\log \frac{[HIn]}{[I{{n}^{-}}]}=pH-p{{K}_{In}}\]               done clear
  B)
                  \[\log \frac{[I{{n}^{-}}]}{[HIn]}=pH-p{{K}_{In}}\]              done clear
  C)
                  \[\log \frac{[I{{n}^{-}}]}{[HIn]}=p{{K}_{In}}-pH\]               done clear
  D)
                  \[\log \frac{[HIn]}{[I{{n}^{-}}]}=p{{K}_{In}}-pH\] done clear
  View Solution play_arrow

• question_answer197)
  Which of the following statement(s) is(are) correct [IIT 1998]
  A)
                  The \[pH\] of \[1.0\times {{10}^{-8}}\,M\]solution of \[HCl\] is 8 done clear
  B)
                  The conjugate base of \[{{H}_{2}}PO_{4}^{-}\] is \[HPO_{4}^{2-}\] done clear
  C)
                  Autoprotolysis constant of water increases with temperature done clear
  D)
                  When a solution of a weak monoprotic acid is titrated against a strong base, at half neutralization point \[pH=\tfrac{1}{2}p{{K}_{a}}\] done clear
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• question_answer198)
  An aqueous solution of sodium carbnate has a pH greater than 7 becaue                                              [DCE 2003]
  A)
                  It contains more carbonate ions than \[{{H}_{2}}O\] molecules done clear
  B)
                  Contains more hydroxide ions than carbonate ions  done clear
  C)
                  \[N{{a}^{+}}\]ions react with water done clear
  D)
                  Carbonate ions react with \[{{H}_{2}}O\] done clear
  View Solution play_arrow

• question_answer199)
  A \[pH\] of 7 signifies     [CPMT 1974; DPMT 1982]
  A)
                  Pure water         done clear
  B)
                  Neutral solution done clear
  C)
                  Basic solution     done clear
  D)
                  Acidic solution done clear
  View Solution play_arrow

• question_answer200)
  Assuming complete dissociation, which of the following aqueous solutions will have the same \[pH\]value [Roorkee Qualifying 1998]
  A)
                  \[N{{H}_{3}}\] of \[0.01\,\,M\,\,HCl\] done clear
  B)
                  \[_{10}\frac{1}{{{K}_{a}}}\] of \[0.01\,\,M\,\,{{H}_{2}}S{{O}_{4}}\] done clear
  C)
                  \[50\,\,ml\] of \[_{10}\frac{1}{{{K}_{a}}}\] done clear
  D)
                  Mixture of 50  \[ml\] of \[0.02\,\,M\,\,{{H}_{2}}S{{O}_{4}}\] and \[50\,\,ml\] of \[0.02\,\,M\,\,NaOH\] done clear
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• question_answer201)
  A buffer solution can be prepared from a mixture of [IIT 1999; KCET 1999; MP PMT 2002]
  A)
                  Sodium acetate and acetic acid in water done clear
  B)
                  Sodium acetate and hydrochloric acid in water done clear
  C)
                  Ammonia and ammonium chloride in water done clear
  D)
                  Ammonia and sodium hydroxide in water done clear
  View Solution play_arrow

• question_answer202)
  Which of the following will not function as a buffer solution [Roorkee 2000]
  A)
                  \[NaCl\] and \[NaOH\] done clear
  B)
                  \[NaOH\] and \[N{{H}_{4}}OH\]                done clear
  C)
                  \[C{{H}_{3}}COON{{H}_{4}}\] and \[HCl\] done clear
  D)
                  Borax and boric acid                 done clear
  View Solution play_arrow

• question_answer203)
  Which one of the following statements is not true [AIEEE 2003]
  A)
                  The conjugate base of \[{{H}_{2}}PO_{4}^{-}\] is \[HPO_{4}^{2-}\] done clear
  B)
                  \[pH+pOH=14\] for all aqueous solutions  done clear
  C)
                  The \[pH\] of \[1\times {{10}^{-8}}M\,HCl\] is 8 done clear
  D)
                  96,500 coulombs of electricity when passed through a \[CuS{{O}_{4}}\] solution deposits 1 gram equivalent of copper at the cathode done clear
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• question_answer204)
  The \[pH\]value of \[0.1\,\,M\,\,HCl\]is approximately 1. What will be the approximate \[pH\]value of 0.05 \[M\,\,{{H}_{2}}S{{O}_{4}}\] [MP PMT 1991]
  A)
                  0.05        done clear
  B)
                  0.5 done clear
  C)
                  1              done clear
  D)
                  2 done clear
  View Solution play_arrow

• question_answer205)
  The \[{{K}_{sp}}\] of \[Mg{{(OH)}_{2}}\] is \[1\times {{10}^{-12}},\,0.01M\,Mg{{(OH)}_{2}}\] will precipitate at the limiting pH          [DPMT 2005]
  A)
                  3              done clear
  B)
                  9 done clear
  C)
                  5              done clear
  D)
                  8 done clear
  View Solution play_arrow

• question_answer206)
  The \[pH\]of an aqueous solution having hydroxide ion concentration as \[1\times {{10}^{-5}}\] is            [MP PMT 1991]
  A)
                  5              done clear
  B)
                  9 done clear
  C)
                  4.5          done clear
  D)
                  11 done clear
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