JEE Main & Advanced Chemistry Solutions / विलयन Question Bank

done Elevation of boiling point of the solvent Total Questions - 23

• question_answer1)
  The latent heat of vapourisation of water is \[9700\,Cal/mole\] and if the b.p. is \[{{100}^{o}}C\], ebullioscopic constant of water is [CBSE PMT 1989]
  A)
                  \[{{0.513}^{o}}C\]            done clear
  B)
                  \[{{1.026}^{o}}C\] done clear
  C)
                  \[{{10.26}^{o}}C\]            done clear
  D)
                  \[{{1.832}^{o}}C\] done clear
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• question_answer2)
  The molal elevation constant of water \[={{0.52}^{o}}C\]. The boiling point of 1.0 molal aqueous \[KCl\] solution (assuming complete dissociation of \[KCl\]), therefore, should be     [BHU 1987]
  A)
                  \[{{100.52}^{o}}C\]          done clear
  B)
                  \[{{101.04}^{o}}C\] done clear
  C)
                  \[{{99.48}^{o}}C\]            done clear
  D)
                  \[{{98.96}^{o}}C\] done clear
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• question_answer3)
  The rise in the boiling point of a solution containing 1.8 gram of glucose in \[100g\] of a solvent in \[{{0.1}^{o}}C\]. The molal elevation constant of the liquid is        [CPMT 1999]
  A)
                  0.01 \[K/m\]           done clear
  B)
                  \[0.1\,K/m\] done clear
  C)
                  \[1\,K/m\]                done clear
  D)
              \[10\,K/m\] done clear
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• question_answer4)
  If \[0.15\,g\] of a solute dissolved in \[15\,g\] of solvent is boiled at a temperature higher by \[{{0.216}^{o}}C\] than that of the pure solvent. The molecular weight of the substance  (molal elevation constant for the solvent is \[{{2.16}^{o}}C\]) is [CBSE PMT 1999; BHU 1997]
  A)
                  1.01        done clear
  B)
                  10 done clear
  C)
                  10.1        done clear
  D)
                  100 done clear
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• question_answer5)
  Pressure cooker reduces cooking time for food because [MP PMT 1987; NCERT 1975; CPMT 1991; AIEEE 2003]
  A)
                  Heat is more evenly distributed in the cooking space done clear
  B)
                  Boiling point of water involved in cooking is increased done clear
  C)
                  The higher pressure inside the cooker crushes the food material done clear
  D)
                  Cooking involves chemical changes helped by a rise in temperature done clear
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• question_answer6)
  Which of the following statements is correct for the boiling point of solvent containing a dissolved solid substance [NCERT 1972, 74]
  A)
                  Boiling point of the liquid is depressed done clear
  B)
                  Boiling point of the liquid is elevated done clear
  C)
                  There is no effect on the boiling point done clear
  D)
                  The change depends upon the polarity of liquid done clear
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• question_answer7)
  When a substance is dissolved in a solvent, the vapour pressure of solvent decreases. It brings                [BHU 2004]
  A)
                  A decrease in boiling point of solution done clear
  B)
              An increase in boiling point of the solution done clear
  C)
                  A decrease in freezing point of the solution done clear
  D)
                  An increase in freezing point of the solution done clear
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• question_answer8)
  Elevation in boiling point was \[{{0.52}^{o}}C\] when \[6\,gm\] of a compound \[X\] was dissolved in \[100\,gm\] of water. Molecular weight of \[X\] is \[({{K}_{b}}\] for water is 0.52 per 1000 gm of water) [CPMT 1989]
  A)
                  120         done clear
  B)
                  60 done clear
  C)
                  180         done clear
  D)
                  600 done clear
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• question_answer9)
  If the solution boils at a temperature \[{{T}_{1}}\] and the solvent at a temperature \[{{T}_{2}}\] the elevation of boiling point is given by [MP PET 1996]
  A)
                  \[{{T}_{1}}+{{T}_{2}}\]   done clear
  B)
                  \[{{T}_{1}}-{{T}_{2}}\] done clear
  C)
                  \[{{T}_{2}}-{{T}_{1}}\]     done clear
  D)
                  \[{{T}_{1}}\div {{T}_{2}}\] done clear
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• question_answer10)
  If for a sucrose solution elevation in boiling point is 0.1°C then what will be the boiling point of NaCl solution for same molal concentration  [BHU 1998, 2005]
  A)
  \[0.1{}^\circ C\]     done clear
  B)
  \[0.2{}^\circ C\] done clear
  C)
  \[0.08{}^\circ C\] done clear
  D)
  \[0.01{}^\circ C\] done clear
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• question_answer11)
  The molal elevation constant is the ratio of the elevation in B.P. to                                                [CPMT 1982]
  A)
                  Molarity  done clear
  B)
                  Molality done clear
  C)
                  Mole fraction of solute          done clear
  D)
                  Mole fraction of solvent done clear
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• question_answer12)
  The molal boiling point constant for water is \[{{0.513}^{o}}C\,kg\,mo{{l}^{-1}}\]. When 0.1 mole of sugar is dissolved in \[200ml\] of water, the solution boils under a pressure of one atmosphere at                                               [AIIMS 1991]
  A)
                  \[{{100.513}^{o}}C\]       done clear
  B)
                  \[{{100.0513}^{o}}C\] done clear
  C)
                  \[{{100.256}^{o}}C\]       done clear
  D)
                  \[{{101.025}^{o}}C\] done clear
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• question_answer13)
  Value of gas constant R is    [AIEEE  2002]
  A)
                  0.082 litre atm       done clear
  B)
                  0.987 cal \[mo{{l}^{-1}}{{K}^{-1}}\] done clear
  C)
              8.3 J \[mo{{l}^{-1}}{{K}^{-1}}\] done clear
  D)
                  83 erg \[mo{{l}^{-1}}{{K}^{-1}}\] done clear
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• question_answer14)
  The temperature, at which the vapour pressure of a liquid becomes equal to the atmospheric pressure is known as [Pb. PMT 2000]
  A)
                  Freezing point       done clear
  B)
                  Boiling point done clear
  C)
                  Absolute temperature           done clear
  D)
                  None of these done clear
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• question_answer15)
  The elevation in boiling point of a solution of 13.44g of CuCl2 in 1kg of water using the following information will be                 (Molecular weight of CuCl2 = 134.4 and Kb­ = 0.52 K molal-1) [IIT 2005]
  A)
                  0.16        done clear
  B)
                  0.05 done clear
  C)
                  0.1          done clear
  D)
                  0.2 done clear
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• question_answer16)
  When 10g of a non-volatile solute is dissolved in 100 g of benzene, it raises boiling point by \[{{1}^{o}}C\] then molecular mass of the solute is \[({{K}_{b}}\]for benzene =2.53k-m?1)            [BHU 2002]
  A)
                  223 g      done clear
  B)
                  233 g done clear
  C)
                  243 g      done clear
  D)
                  253 g done clear
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• question_answer17)
  An aqueous solution containing 1g of urea boils at \[{{100.25}^{o}}C\]. The aqueous solution containing 3 g  of glucose in the same volume will boil at (Molecular weight of urea and glucose are 60 and 180 respectively)                                 [CBSE PMT 2000]
  A)
                  \[{{100.75}^{o}}C\]          done clear
  B)
                  \[{{100.5}^{o}}C\] done clear
  C)
                  \[{{100.25}^{o}}C\]          done clear
  D)
                  \[{{100}^{o}}C\] done clear
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• question_answer18)
  When common salt is dissolved in water [CBSE PMT 1988; MP PET 1995; DCE 2000]
  A)
                  Melting point of the solution increases done clear
  B)
                  Boiling point of the solution increases done clear
  C)
                  Boiling point of the solution decreases done clear
  D)
                  Both melting point and boiling point decreases done clear
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• question_answer19)
  During the evaporation of liquid         [DCE 2003]
  A)
                  The temperature of the liquid will rise done clear
  B)
                  The temperature of the liquid will fall done clear
  C)
                  May rise or fall depending on the nature done clear
  D)
                  The temperature remains unaffected done clear
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• question_answer20)
  At higher altitudes the boiling point of water lowers because [NCERT 1972; CPMT 1994; J & K 2005]
  A)
                  Atmospheric pressure is low done clear
  B)
                  Temperature is low done clear
  C)
                  Atmospheric pressure is high done clear
  D)
                  None of these done clear
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• question_answer21)
  The elevation in boiling point for one molal solution of a solute in a solvent is called                [MH CET 2001]
  A)
                  Boiling point constant          done clear
  B)
                  Molal elevation constant done clear
  C)
                  Cryoscopic constant              done clear
  D)
                  None of these done clear
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• question_answer22)
  A solution of 1 molal concentration of a solute will have  maximum boiling point elevation when the solvent  is [MP PMT 2000]
  A)
                  Ethyl alcohol          done clear
  B)
                  Acetone done clear
  C)
                  Benzene done clear
  D)
                  Chloroform done clear
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• question_answer23)
  Mark the correct relationship between the boiling points of very dilute solutions of \[BaC{{l}_{2}}\,({{t}_{1}})\] and \[KCl\,({{t}_{2}})\], having the same molarity  [CPMT 1984, 93]
  A)
                  \[{{t}_{1}}={{t}_{2}}\] done clear
  B)
                  \[{{t}_{1}}>{{t}_{2}}\] done clear
  C)
                  \[{{t}_{2}}>{{t}_{1}}\] done clear
  D)
                  \[{{t}_{2}}\] is approximately equal to \[{{t}_{1}}\] done clear
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