JEE Main & Advanced Chemistry Solutions / विलयन Question Bank

done Depression of freezing point of the solvent Total Questions - 27

• question_answer1)
  Molal depression constant for water is \[{{1.86}^{o}}C\]. The freezing point of a 0.05 molal solution of a non-electrolyte in water is             [MNR 1990; MP PET 1997]
  A)
                  \[-{{1.86}^{o}}C\]             done clear
  B)
                  \[-{{0.93}^{o}}C\] done clear
  C)
              \[-{{0.093}^{o}}C\]         done clear
  D)
                  \[{{0.93}^{o}}C\] done clear
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• question_answer2)
  The  amount of urea to be dissolved in 500 ml of water (K =18.6 K \[mol{{e}^{-1}}\]in 100g solvent)  to produce  a  depression of \[{{0.186}^{o}}C\] in  freezing point  is          [MH CET 2000]
  A)
                  9 g  done clear
  B)
                  6 g done clear
  C)
                  3 g           done clear
  D)
                  0.3 g done clear
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• question_answer3)
  The maximum freezing point falls in   [MP PMT 1986]
  A)
                  Camphor                done clear
  B)
                  Naphthalene done clear
  C)
                  Benzene done clear
  D)
                  Water done clear
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• question_answer4)
  Which one of the following statements is FALSE [AIEEE 2004]
  A)
                  The correct order of osmotic pressure for 0.01 M aqueous solution of each compound is \[BaC{{l}_{2}}>KCl>C{{H}_{3}}COOH>\] sucrose. done clear
  B)
                  The osmotic pressure \[(\pi )\] of a solution is given by the equation \[\pi =MRT\] where M is the molarity of the solution. done clear
  C)
                  Raoult's law states that the vapour pressure of a component over a solution is proportional to its mole fraction. done clear
  D)
                  Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression. done clear
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• question_answer5)
  Solute when dissolved in water          [MADT Bihar 1981]
  A)
                  Increases the vapour pressure of water done clear
  B)
                  Decreases the boiling point of water done clear
  C)
                  Decreases the freezing point of water done clear
  D)
                  All of the above done clear
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• question_answer6)
  The freezing point of a solution prepared from \[1.25\,gm\] of a non-electrolyte and \[20\,gm\] of water is \[271.9\,K\]. If molar depression constant is \[1.86K\,mol{{e}^{-1}}\], then molar mass of the solute will be              [AFMC 1998; CPMT 1999]
  A)
                  105.7      done clear
  B)
                  106.7 done clear
  C)
                  115.3      done clear
  D)
                  93.9 done clear
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• question_answer7)
  What is the freezing point of a solution containing \[8.1\,g\,HBr\] in \[100g\] water assuming the acid to be 90% ionised \[({{K}_{f}}\] for water \[=1.86\,K\,mol{{e}^{-1}})\]                 [BHU 1981; Pb CET 2004]
  A)
                  \[{{0.85}^{o}}C\]              done clear
  B)
                  \[-{{3.53}^{o}}C\] done clear
  C)
                  \[{{0}^{o}}C\]    done clear
  D)
                  \[-{{0.35}^{o}}C\] done clear
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• question_answer8)
  If \[{{K}_{f}}\] value of \[{{H}_{2}}O\] is 1.86. The value of \[\Delta {{T}_{f}}\] for \[0.1m\] solution of non-volatile solute is
  A)
                  18.6        done clear
  B)
                  0.186 done clear
  C)
                  1.86        done clear
  D)
                  0.0186 done clear
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• question_answer9)
  1% solution of \[Ca{{(N{{O}_{3}})}_{2}}\] has freezing point [DPMT 1982, 83; CPMT 1977]
  A)
                  \[{{0}^{o}}C\]    done clear
  B)
                  Less than \[{{0}^{o}}C\] done clear
  C)
                  Greater than \[{{0}^{o}}C\]              done clear
  D)
                  None of the above done clear
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• question_answer10)
  A solution of urea \[\left( mol.\text{ }mass\text{ }56g\text{ }mo{{l}^{-1}} \right)\] boils at 100.18°C  at the atmospheric pressure. If \[{{K}_{f}}\] and \[{{K}_{b}}\]for water are 1.86 and \[0.512K\text{ }kg\text{ }mo{{l}^{-1}}\] respectively the above solution will freeze at      [CBSE PMT 2005]
  A)
  \[\,- 6.54{}^\circ C\] done clear
  B)
  \[6.54{}^\circ C\] done clear
  C)
  \[0.654{}^\circ C\] done clear
  D)
  \[-0.654{}^\circ C\] done clear
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• question_answer11)
  The molar freezing point constant for water is \[{{1.86}^{o}}C\,mol{{e}^{-1}}\]. If 342 gm of canesugar  \[({{C}_{12}}{{H}_{22}}{{O}_{11}})\] are dissolved in 1000 \[gm\] of water, the solution will freeze at [NCERT 1977; CPMT 1989; Roorkee 2000; DCE 2004]
  A)
                  \[-{{1.86}^{o}}C\]             done clear
  B)
                  \[{{1.86}^{o}}C\] done clear
  C)
                  \[-{{3.92}^{o}}C\]             done clear
  D)
                  \[{{2.42}^{o}}C\] done clear
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• question_answer12)
  An aqueous solution of a non-electrolyte boils at \[{{100.52}^{o}}C\]. The freezing point of the solution will be
  A)
                  \[{{0}^{o}}C\]    done clear
  B)
              \[-{{1.86}^{o}}C\] done clear
  C)
                  \[{{1.86}^{o}}C\]              done clear
  D)
                  None of the above done clear
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• question_answer13)
  The freezing point of one molal \[NaCl\] solution assuming \[NaCl\]  to be 100% dissociated in water is (molal depression constant = 1.86) [CPMT 1985; BHU 1981; MP PMT 1997; UPSEAT 2001]
  A)
                  \[-{{1.86}^{o}}C\]             done clear
  B)
                  \[-{{3.72}^{o}}C\] done clear
  C)
                  \[+{{1.86}^{o}}C\] done clear
  D)
                  \[+{{3.72}^{o}}C\] done clear
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• question_answer14)
  Heavy water freezes at          [CPMT 1993]
  A)
                  \[{{0}^{o}}C\]    done clear
  B)
              \[{{3.8}^{o}}C\] done clear
  C)
                  \[{{38}^{o}}C\]  done clear
  D)
                  \[-{{0.38}^{o}}C\] done clear
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• question_answer15)
  After adding a solute freezing point of solution decreases to ? 0.186. Calculate \[\Delta {{T}_{b}}\] if \[{{K}_{f}}=1.86\] and \[{{K}_{b}}=0.521\]. [Orissa JEE  2002, 04; MP PET/PMT 1998; AIEEE 2000]
  A)
                  0.521      done clear
  B)
                  0.0521 done clear
  C)
                  1.86        done clear
  D)
                  0.0186 done clear
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• question_answer16)
  Given that \[\Delta {{T}_{f}}\] is the depression in freezing point of the solvent in a solution of a non-volatile solute of molality \[m\], the quantity  \[\underset{m\to 0}{\mathop{\lim }}\,\left( \frac{\Delta {{T}_{f}}}{m} \right)\] is equal to [IIT 1994; UPSEAT 2001]
  A)
                  Zero        done clear
  B)
                  One done clear
  C)
                  Three      done clear
  D)
                  None of the above done clear
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• question_answer17)
  The freezing point of 1 percent solution of lead nitrate in water will be [NCERT 1971, 72; CPMT 1972; JIPMER 1991]
  A)
                  Below \[{{0}^{o}}C\]        done clear
  B)
                  \[{{0}^{o}}C\] done clear
  C)
                  \[{{1}^{o}}C\]    done clear
  D)
                  \[{{2}^{o}}C\] done clear
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• question_answer18)
  What is the effect of the addition of sugar on the boiling and freezing points of water                 [Kerala CET (Med.) 2003]
  A)
                  Both boiling point and freezing point increases                done clear
  B)
                  Both boiling point and freezing point decreases               done clear
  C)
                  Boiling point increases and freezing point decreases       done clear
  D)
                  Boiling point decreases and freezing point increases       done clear
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• question_answer19)
  During depression of freezing point in a solution the following are in equilibrium      [IIT Screening 2003]
  A)
                  Liquid solvent, solid solvent done clear
  B)
                  Liquid solvent, solid solute done clear
  C)
                  Liquid solute, solid solute done clear
  D)
                  Liquid solute solid solvent done clear
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• question_answer20)
  1.00 gm of a non-electrolyte solute dissolved in 50 gm of benzene lowered the freezing point of benzene by 0.40 K. \[{{K}_{f}}\] for benzene is 5.12 kg  mol?1. Molecular mass of the solute will be         [DPMT 2004]
  A)
                  \[256\,g\,mo{{l}^{-1}}\]    done clear
  B)
                  \[2.56\,g\,mo{{l}^{-1}}\] done clear
  C)
                  \[512\times {{10}^{3}}\,g\,mo{{l}^{-1}}\]  done clear
  D)
                  \[2.56\times {{10}^{4}}\,g\,mo{{l}^{-1}}\] done clear
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• question_answer21)
  0.440 g of a substance dissolved in 22.2 g of benzene lowered the freezing point of benzene by \[{{0.567}^{o}}C\]. The molecular mass of the substance \[({{K}_{f}}={{5.12}^{o}}C\,mo{{l}^{-1}})\] [BHU 2001; CPMT 2001]
  A)
                  178.9      done clear
  B)
                  177.8 done clear
  C)
                  176.7      done clear
  D)
                  175.6 done clear
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• question_answer22)
  Which of the following aqueous molal solution have highest freezing point [UPSEAT 2000, 01, 02; MNR 1988]
  A)
                  Urea        done clear
  B)
                  Barium chloride done clear
  C)
                  Potassium bromide               done clear
  D)
                  Aluminum sulphate done clear
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• question_answer23)
  Which will show maximum depression in freezing point when concentration is 0.1M                [IIT 1989; MNR 1990; UPSEAT 2000; 03; BCECE 2005]
  A)
                  NaCl       done clear
  B)
                  Urea done clear
  C)
                  Glucose  done clear
  D)
              \[{{K}_{2}}S{{O}_{4}}\] done clear
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• question_answer24)
  The freezing point of a 0.01M aqueous glucose solution at 1 atmosphere is \[-{{0.18}^{o}}C\]. To it, an addition of equal volume of 0.002 M glucose solution will; produce a solution with freezing point of nearly          [AMU 1999]
  A)
                  \[-{{0.036}^{o}}C\]           done clear
  B)
                  \[-{{0.108}^{o}}C\] done clear
  C)
                  \[-{{0.216}^{o}}C\]           done clear
  D)
                  \[-{{0.422}^{o}}C\] done clear
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• question_answer25)
  What should be the freezing point of aqueous solution containing \[17\,gm\] of \[{{C}_{2}}{{H}_{5}}OH\] in \[1000\,gm\] of water (water \[{{K}_{f}}\] = 1.86 \[\deg -kg\,mo{{l}^{-1}}\]             [MP PMT 1986]
  A)
              \[-{{0.69}^{o}}C\]           done clear
  B)
                  \[-{{0.34}^{o}}C\] done clear
  C)
                  \[{{0.0}^{o}}C\]                 done clear
  D)
                  \[{{0.34}^{o}}C\] done clear
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• question_answer26)
  In the depression of freezing point experiment, it is found that the [IIT 1999]
  A)
                  Vapour pressure of the solution is less than that of pure solvent done clear
  B)
                  Vapour pressure of the solution is more than that of pure solvent done clear
  C)
                  Only solute molecules solidify at the freezing point done clear
  D)
                  Only solvent molecules solidify at the freezing point done clear
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• question_answer27)
  Calculate the molal depression constant of a solvent which has freezing point \[{{16.6}^{o}}C\] and latent heat of fusion \[180.75\,J{{g}^{-1}}\].      [Orissa JEE  2005]
  A)
                  2.68        done clear
  B)
                  3.86 done clear
  C)
                  4.68        done clear
  D)
                  2.86t6 done clear
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