JEE Main & Advanced Chemistry Solutions / विलयन Question Bank

done Mock Test - Solutions Total Questions - 25

• question_answer1)
  The molality of a urea solution in which 0.0200 g of urea  (\[N{{H}_{2}}CON{{H}_{2}}\]) is added to 0.400 \[d{{m}^{3}}\] of water at STP is
  A)
  \[0.555\,mol\,k{{g}^{-1}}\] done clear
  B)
  \[5.55\times {{10}^{-4}}\,mol\,k{{g}^{-1}}\] done clear
  C)
  \[8.33\times {{10}^{-4}}\,mol\,k{{g}^{-1}}\] done clear
  D)
  \[33.3\,mol\,k{{g}^{-1}}\] done clear
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• question_answer2)
  Molar solubility of helium, nitrogen and oxygen are plotted against partial pressure of the gas at constant temperature. Henry's law constant for hese gases will lie in the following sequence?
  A)
  \[{{O}_{2}}>{{N}_{2}}>He\] done clear
  B)
  \[{{O}_{2}}<{{N}_{2}}<He\] done clear
  C)
  \[{{O}_{2}}={{N}_{2}}=He\] done clear
  D)
  \[{{O}_{2}}>{{N}_{2}}>He\] done clear
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• question_answer3)
  Henry's law constant for \[{{N}_{2}}\] at 310 K is 82.35 kbar. \[{{N}_{2}}\] exerts a partial pressure of 0.840 bar. If \[{{N}_{2}}\] gas is bubbled through water at 293 K, then the number of millimoles of \[{{N}_{2}}\] that will dissolve in 1 L of water is
  A)
  \[0.0716\]          done clear
  B)
  \[1.30\times {{10}^{-5}}\] done clear
  C)
  \[1.25\times {{10}^{-2}}\]         done clear
  D)
  0.0555 done clear
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• question_answer4)
  Out of the following liquid pair which solution follows the positive deviation from Raoult's law?
  A)
  Acetone + Chloroform done clear
  B)
  Water + Nitric acid done clear
  C)
  Water + Hydrochloric acid done clear
  D)
  Benzene + Methanol done clear
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• question_answer5)
  What mass of non-volatile solute (urea) needs to be dissolved in 150 g of water in order to decrease the vapour pressure of water by 35%. What will be the molality of solution?
  A)
  23.88    done clear
  B)
  31.12 done clear
  C)
  25.47    done clear
  D)
  29.92 done clear
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• question_answer6)
  An ideal mixture of liquids A and B with 2 moles of A and 2 moles of B has a total vapour pressure of 1 atm at a certain temperature. Another mixture with 1 mole of A and 3 moles of B has a vapour pressure greater than 1 atm. But if 4 moles of C are added to the second mixture, the vapour pressure comes down to 1 atm. Vapour pressure of C, \[P_{c}^{0}\]=0.8 atm. Calculate the vapour pressures of pure A and pure B
  A)
  \[P_{A}^{o}\]=1.4 atm, \[P_{B}^{o}\]=0.7 atm done clear
  B)
  \[P_{A}^{o}\]=1.2atm, \[P_{B}^{o}\]=0.6atm done clear
  C)
  \[P_{A}^{o}\]=1.4atm, \[P_{B}^{o}\]=0.6atm done clear
  D)
  \[P_{A}^{o}\]= 0.6 atm, \[P_{B}^{o}\]= 1.4 atm done clear
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• question_answer7)
  The vapour pressure of n-hexane at 350 K is 840 torr and that of cyclohexane is 600 torr. Mote fraction of hexane in the mixture that boils at 350 K and 1 atm pressure assuming ideal behaviour is
  A)
  0.67                  done clear
  B)
  0.80 done clear
  C)
  0.50                  done clear
  D)
  2.2 done clear
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• question_answer8)
  A current of dry air is passed through a bulb containing 5 g of a solute in 100 g of water and then through water alone. The losses in weight of the solution and pure water were respectively 0.78 g and 0.02 g. Calculate relative lowering of vapour pressure.
  A)
  2.04                  done clear
  B)
  1.05 done clear
  C)
  0.03                  done clear
  D)
  0.09 done clear
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• question_answer9)
  How many grams of sucrose (M. wt. = 342) should be dissolved in 100 g water in order to produce a solution with a \[105.0{}^\circ C\] difference between the boiling point and the freezing temperatures? \[({{K}_{f}}=\text{ }1.86\text{ }C\text{/}m,\,\,{{K}_{b}}=0.51{}^\circ C\text{/}m)\]
  A)
  34.2 g   done clear
  B)
  72 g done clear
  C)
  342 g    done clear
  D)
  460 g done clear
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• question_answer10)
  Which of the given aqueous solution has the maximum boiling point? \[({{K}_{b}}\,of\,{{H}_{2}}O)=0.52{}^\circ \,mo{{l}^{-1}}kg),\,{{T}_{b}}({{H}_{2}}O)=373K)\]
  A)
  6% urea solution by weight of solution done clear
  B)
  18% glucose solution by weight of solution done clear
  C)
  34.2% sucrose solution by weight of solution done clear
  D)
  All have equal boiling points done clear
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• question_answer11)
  The boiling point elevation constant for benzene is \[2.57{}^\circ C/m.\] The boiling point of benzene is \[81{}^\circ C\]. Determine the boiling point of solution formed when 10 g of \[{{C}_{4}}{{H}_{12}}\]is dissolved in 20 g benzene.
  A)
  71.46    done clear
  B)
  7.14 done clear
  C)
  85.76    done clear
  D)
  88.14    done clear
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• question_answer12)
  The cryoscopic constant for acetic acid is 3.6 K kg/mol. A solution of 1 g of a hydrocarbon in 100 g of acetic acid freezes at \[16.14{}^\circ C\]instead of the usual\[16.60{}^\circ C\]. The hydrocarbon contains 92.3% carbon. What is the'molecular formula?
  A)
  \[{{C}_{6}}{{H}_{6}}\]           done clear
  B)
  \[{{C}_{6}}{{H}_{12}}\] done clear
  C)
  \[{{C}_{8}}{{H}_{18}}\]          done clear
  D)
  \[{{C}_{10}}{{H}_{6}}\] done clear
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• question_answer13)
  Solute A is a ternary electrolyte and solute B is non-electrolyte. If 0.1 M solution of solute B produces an osmotic pressure of 2P, then 0.05 M solution of A at the same temperature will produce an osmotic pressure equal to:
  A)
  P                      done clear
  B)
  1.5P done clear
  C)
  IP                     done clear
  D)
  3P done clear
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• question_answer14)
  Freezing point of a biological fluid is \[-0.60{}^\circ C\]in aqueous solution \[{{K}_{f}}({{H}_{2}}O)=\text{ }1.86{}^\circ mo{{l}^{-}}~kg.\] Thus, its osmotic pressure at 310 K is (assume molarity = molality)
  A)
  0.0766 atm        done clear
  B)
  7.66 atm done clear
  C)
  0.766 atm          done clear
  D)
  8.19 atm done clear
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• question_answer15)
  Phenol associates in benzene to a certain extent to form a dimer. A solution containing \[20\times {{10}^{-3}}\] kg of phenol in 1.0 kg-of benzene has its freezing point depressed by 0.69 K. Calculate the fraction of phenol that has dimerised. (\[{{K}_{f}}\]for benzene = 5.12 K kg \[mo{{l}^{-1}}\])
  A)
  28.5%   done clear
  B)
  32.6% done clear
  C)
  73.3%   done clear
  D)
  82% done clear
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• question_answer16)
  A living cell contains a solution which is isotonic with 0.3 (M) sugar solution. What osmotic pressure develops when the cell is placed in 0.1 (M) KCl solution at body temperature?
  A)
  5.08 atm           done clear
  B)
  2.54 atm done clear
  C)
  4.92 atm           done clear
  D)
  2.46 atm done clear
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• question_answer17)
  The degree of dissociation of \[Ca{{(N{{O}_{3}})}_{2}}\] in a dilute solution containing 14 g of the salt per 200 g of water at \[100{}^\circ C\]is 70%. If the vapour pressure of water is 760 mmHg, calculate the vapour pressure of solution.
  A)
  750.6 mmHg      done clear
  B)
  755.8 mmHg done clear
  C)
  745.98 mmHg done clear
  D)
  739.56 mmHg done clear
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• question_answer18)
  In a mixture of A and B, components show -ve deviations as,
  A)
  \[\Delta {{V}_{mix}}\,\text{is}+ve\] done clear
  B)
  \[A-B\] interaction is weaker than \[A-A\] and \[B-B\] interaction done clear
  C)
  \[\Delta {{H}_{mix}}\,\text{is}+ve\]                                   done clear
  D)
  A-B interaction is stronger than \[A-A\] and \[B-B\] interaction done clear
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• question_answer19)
  The elevation in boiling point of a solution of 13.44 g of\[CuC{{l}_{2}}\], (molecular weight = 134.4, \[{{K}_{b}}\] = 0.52 K \[molalit{{y}^{-1}}\] in 1 kg water using the given information will be
  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_answer20)
  The degree of dissociation (1) of a weak electrolyte \[{{A}_{x}}{{B}_{y}}\] is related to van't Hoff factor (i) by the expression
  A)
  \[\alpha =\frac{i-1}{(x+y-1)}\] done clear
  B)
  \[\alpha =\frac{i-1}{x+y+1}\] done clear
  C)
  \[\alpha =\frac{x+y-1}{i-1}\]                  done clear
  D)
  \[\alpha =\frac{x+y+1}{i-1}\] done clear
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• question_answer21)
  The mass of a non-volatile solute of molar mass 40 g \[mo{{l}^{-1}}\], which on dissolution in 57 g octane to reduce the vapom pressure of octane by 20%, is
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• question_answer22)
  A 1.17% solution of NaCl is isotonic with 7.2% solution of glucose. Calculate the van't Hoff factor of NaCl.
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• question_answer23)
  A mixture of two immiscible liquids nitrobenzene and water boiling at \[99{}^\circ C\] has a partial pressure of watd 733 mm and of nitrobenzene 27 mm. The ratio of mass of water and nitrobenzene in mixture is....
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• question_answer24)
  An aqueous solution of a substance with molar mass 240 has osmotic pressure 0.2 atm at 300 K. The density solution in \[g\text{/}d{{m}^{3}}\] is: (R = 0.08 litre atm \[{{K}^{-1}}\]\[mo{{l}^{-1}}\])
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• question_answer25)
  A solution of 6.2 g of ethylene glycol in 55 g \[{{H}_{2}}O\] is cooled to \[-\,3.72{}^\circ C\]. The ice separated from the solution is: (\[{{K}_{f}}\]of \[{{H}_{2}}O\]= 1.86 K\[molalit{{y}^{-1}}\])
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