JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank

done Electrical conductors, Arrhenius theory and ostwald's dilution law Total Questions - 36

• question_answer1)
  Which of the following is non-electrolyte              [CPMT 2001]
  A)
                  \[NaCl\]               done clear
  B)
                  \[CaC{{l}_{2}}\] done clear
  C)
                  \[{{C}_{12}}{{H}_{22}}{{O}_{11}}\] done clear
  D)
                  \[C{{H}_{3}}COOH\] done clear
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• question_answer2)
  Ammonium hydroxide is a           [CPMT 1977]
  A)
                  Strong electrolyte done clear
  B)
                  Weak electrolyte done clear
  C)
                  Both under different conditions done clear
  D)
                  Non-electrolyte done clear
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• question_answer3)
  Ammonium hydroxide is a weak base because [MP PET 2000]
  A)
                  It has low vapour pressure done clear
  B)
                  It is only slightly ionized  done clear
  C)
                  It is not a hydroxide of any metal done clear
  D)
                  It has low density done clear
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• question_answer4)
  Electrolytes when dissolved in water dissociate into their constituent ions. The degree of dissociation of an electrolyte increases with   [CPMT 1974]
  A)
                  Increasing concentration of the electrolyte done clear
  B)
                  Decreasing concentration of the electrolyte done clear
  C)
                  Decreasing temperature done clear
  D)
                  Presence of a substance yielding a common ion done clear
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• question_answer5)
  An electrolyte    [MP PMT/PET 1988; CPMT 1974]
  A)
                  Gives complex ions in solution done clear
  B)
                  Dissolves in water to give ions done clear
  C)
                  Is ionized in the solid state done clear
  D)
                  Generates ions on passing electric current done clear
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• question_answer6)
  A monoprotic acid in 1.00 M solution is 0.01% ionised. The dissociation constant of this acid is      [BVP 2003]
  A)
                  \[1\times {{10}^{-8}}\]   done clear
  B)
                  \[1\times {{10}^{-4}}\] done clear
  C)
                  \[1\times {{10}^{-6}}\]   done clear
  D)
                  \[{{10}^{-5}}\] done clear
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• question_answer7)
  Molten sodium chloride conducts electricity due to the presence of                                        [BHU 2001]
  A)
                  Free electrons done clear
  B)
                  Free ions done clear
  C)
                  Free molecules done clear
  D)
                  Atoms of sodium and chlorine done clear
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• question_answer8)
  An example for a strong electrolyte is    [KCET 2002]
  A)
                  Urea      done clear
  B)
                  Ammonium hydroxide done clear
  C)
                  Sugar     done clear
  D)
                  Sodium acetate done clear
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• question_answer9)
  Which one is strongest electrolyte in the following [CPMT 1990]
  A)
                  \[NaCl\]               done clear
  B)
                  \[C{{H}_{3}}COOH\] done clear
  C)
                  \[N{{H}_{4}}OH\]             done clear
  D)
                  \[{{C}_{6}}{{H}_{12}}{{O}_{6}}\] done clear
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• question_answer10)
  The equivalent conductance at infinite dilution of a weak acid such as \[HF\]       [Pb. PMT 1998]
  A)
                  Can be determined by measurement of very dilute \[HF\] solution done clear
  B)
                  Can be determined by extrapolation of measurements on dilute solutions of \[HCl,\,\,HBr\] and \[HI\] done clear
  C)
                  Can best be determined from measurements on dilute solutions of \[NaF,\,\,NaCl\] and \[HCl\] done clear
  D)
                  Is an undefined quantity done clear
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• question_answer11)
  If \[\alpha \] is the degree of ionization, \[C\] the concentration of a weak electrolyte and \[{{K}_{a}}\]the acid ionization constant, then the correct relationship between \[\alpha ,\,\,C\] and \[{{K}_{a}}\]is [CET Pune 1998; Pb. PMT 1998; RPMT 2002]
  A)
                  \[{{\alpha }^{2}}=\sqrt{\frac{{{K}_{a}}}{C}}\]       done clear
  B)
                  \[{{\alpha }^{2}}=\sqrt{\frac{C}{{{K}_{a}}}}\] done clear
  C)
                  \[\alpha =\sqrt{\frac{{{K}_{a}}}{C}}\]      done clear
  D)
                  \[\alpha =\sqrt{\frac{C}{{{K}_{a}}}}\] done clear
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• question_answer12)
  Theory of ionization was given by [AMU 1983; DPMT 1985]
  A)
                  Rutherford         done clear
  B)
                  Graham done clear
  C)
                  Faraday                done clear
  D)
                  Arrhenius done clear
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• question_answer13)
  An ionizing solvent has
  A)
                  Low value of dielectric constant done clear
  B)
                  High value of dielectric constant done clear
  C)
                  A dielectric constant equal to 1 done clear
  D)
                  Has a high melting point done clear
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• question_answer14)
  The extent of ionization increases            [MNR 1982]
  A)
                  With the increase in concentration of solute done clear
  B)
                  On addition of excess water to solution done clear
  C)
                  On decreasing the temperature of solution done clear
  D)
                  On stirring the solution vigorously done clear
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• question_answer15)
  Which is generally true about ionic compounds [Pb. PMT 2002]
  A)
                  Have low boiling point done clear
  B)
                  Have low melting point done clear
  C)
                  Soluble in non-polar solvents done clear
  D)
                  Conduct electricity in the fused state done clear
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• question_answer16)
  At infinite dilution, the percentage ionisation for both strong and weak electrolytes is    [CPMT 1999]
  A)
                  1%          done clear
  B)
                  20% done clear
  C)
                  50%        done clear
  D)
                  100% done clear
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• question_answer17)
  The degree of ionization of a compound depends on [MNR 1980]
  A)
                  Size of solute molecules done clear
  B)
                  Nature of solute molecules done clear
  C)
                  Nature of vessel used done clear
  D)
                  Quantity of electricity passed done clear
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• question_answer18)
  For a weak acid \[HA,\] Ostwald's dilution law is represented by the equation
  A)
                  \[{{K}_{a}}=\frac{\alpha c}{1-{{\alpha }^{2}}}\]   done clear
  B)
                  \[{{K}_{a}}=\frac{{{\alpha }^{2}}c}{1-\alpha }\] done clear
  C)
                  \[\alpha =\frac{{{K}_{a}}c}{1-c}\]              done clear
  D)
                  \[{{K}_{a}}=\frac{{{\alpha }^{2}}c}{1-{{\alpha }^{2}}}\] done clear
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• question_answer19)
  Acetic acid is a weak electrolyte because              [CPMT 1974]
  A)
                  Its molecular weight is high done clear
  B)
                  It is covalent compound done clear
  C)
                  It does not dissociate much or its ionization is very less done clear
  D)
                  It is highly unstable done clear
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• question_answer20)
  In which of the following dissociation of \[N{{H}_{4}}OH\] will be minimum                                          [MP PET 2000]
  A)
                  \[NaOH\]             done clear
  B)
                  \[{{H}_{2}}O\] done clear
  C)
                  \[N{{H}_{4}}Cl\]               done clear
  D)
                  \[NaCl\] done clear
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• question_answer21)
  Vant hoff factor of \[BaC{{l}_{2}}\] of conc. \[0.01M\] is 1.98. Percentage dissociation of \[BaC{{l}_{2}}\] on this conc. Will be [Kerala CET 2005]
  A)
                  49           done clear
  B)
                  69 done clear
  C)
                  89           done clear
  D)
                  98 done clear
  E)
                  100 done clear
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• question_answer22)
  In which of the following solutions, ions are present [NCERT 1981]
  A)
                  Sucrose in water              done clear
  B)
                  Sulphur in \[C{{S}_{2}}\] done clear
  C)
                  Caesium nitrate in water              done clear
  D)
                  Ethanol in water done clear
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• question_answer23)
  The following equilibrium exists inaqueous solution, \[C{{H}_{3}}COOH\]⇄\[C{{H}_{3}}CO{{O}^{-}}+{{H}^{+}}\] if dil HCl is added, without change in temperature, the                   [UPSEAT 2000, 02]
  A)
                  Concentration of \[C{{H}_{3}}CO{{O}^{-}}\] will increase done clear
  B)
                  Concentration of \[C{{H}_{3}}CO{{O}^{-}}\] will decrease done clear
  C)
                  The equilibrium constant will increase done clear
  D)
                  The equilibrium constant will decrease done clear
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• question_answer24)
  Which will not affect the degree of ionisation [MP PMT 1994]
  A)
                  Temperature     done clear
  B)
                  Concentration done clear
  C)
                  Type of solvent done clear
  D)
                  Current done clear
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• question_answer25)
  The addition of a polar solvent to a solid electrolyte results in     [NCERT 1973]
  A)
                  Polarization        done clear
  B)
                  Association done clear
  C)
                  Ionization            done clear
  D)
                  Electron transfer done clear
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• question_answer26)
  The degree of dissociation of \[0.1\,M\,HCN\] solution is 0.01%. Its ionisation constant would be [RPMT 1999]
  A)
                  \[{{10}^{-3}}\]   done clear
  B)
                  \[{{10}^{-5}}\] done clear
  C)
                  \[{{10}^{-7}}\]   done clear
  D)
                  \[{{10}^{-9}}\] done clear
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• question_answer27)
  The hydrogen ion concentration in weak acid of dissociation constant \[{{K}_{a}}\]and concentration \[c\] is nearly equal to [CBSE PMT 1989; RPMT 2000]
  A)
                  \[\sqrt{{{K}_{a}}/c}\]      done clear
  B)
                  \[c/{{K}_{a}}\] done clear
  C)
                  \[{{K}_{a}}c\]     done clear
  D)
                  \[\sqrt{{{K}_{a}}c}\] done clear
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• question_answer28)
  Degree of dissociation of \[0.1\,N\,\,C{{H}_{3}}COOH\] is                 (Dissociation constant \[=1\times {{10}^{-5}}\]) [MP PET 1997]
  A)
                  \[{{10}^{-5}}\]   done clear
  B)
                  \[{{10}^{-4}}\] done clear
  C)
                  \[{{10}^{-3}}\]   done clear
  D)
                  \[{{10}^{-2}}\] done clear
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• question_answer29)
  Which of the following substance is an electrolyte [MADT Bihar 1980]
  A)
                  Chloroform done clear
  B)
                  Benzene done clear
  C)
                  Toluene done clear
  D)
                  Magnesium chloride done clear
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• question_answer30)
  In weak electrolytic solution, degree of ionization
  A)
                  Will be proportional to dilution done clear
  B)
                  Will be proportional to concentration of electrolyte done clear
  C)
                  Will be proportional to the square root of dilution done clear
  D)
                  Will be reciprocal to the dilution done clear
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• question_answer31)
  0.2 molar solution of formic acid is ionized 3.2%. Its ionization constant  is              [MP PMT 1991]
  A)
                  \[1\times {{10}^{-12}}\] done clear
  B)
                  \[2.1\times {{10}^{-4}}\] done clear
  C)
                  \[1.25\times {{10}^{-6}}\]             done clear
  D)
                  \[1\times {{10}^{-14}}\] done clear
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• question_answer32)
  The best conductor of electricity is a 1.0 M solution of [NCERT 1973]
  A)
                  Boric acid             done clear
  B)
                  Acetic acid done clear
  C)
                  Sulphuric acid    done clear
  D)
                  Phosphoric acid done clear
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• question_answer33)
  The colour of an electrolyte solution depends on [DPMT 1985]
  A)
                  The nature of the anion done clear
  B)
                  The nature of the cation done clear
  C)
                  The nature of both the ions done clear
  D)
                  The nature of the solvent done clear
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• question_answer34)
  Ionisation depends upon             [CPMT 2004]
  A)
                  Pressure              done clear
  B)
                  Volume done clear
  C)
                  Dilution done clear
  D)
                  None of these done clear
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• question_answer35)
  The values of dissociation constants of some acids (at \[{{25}^{o}}C\]) are as follows. Indicate which is the trongest acid in water                                      [MP PMT 1991]
  A)
                  \[1.4\times {{10}^{-2}}\]               done clear
  B)
                  \[1.6\times {{10}^{-4}}\] done clear
  C)
                  \[4.4\times {{10}^{-10}}\]             done clear
  D)
                  \[4.3\times {{10}^{-7}}\] done clear
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• question_answer36)
  Concentration \[C{{N}^{-}}\] in \[0.1\,M\,HCN\] is  \[[{{K}_{a}}=4\times {{10}^{-10}}]\] [RPET 2000]
  A)
                  \[2.5\times {{10}^{-6}}M\]           done clear
  B)
                  \[4.5\times {{10}^{-6}}M\] done clear
  C)
                  \[6.3\times {{10}^{-6}}M\]           done clear
  D)
                  \[9.2\times {{10}^{-6}}M\] done clear
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