JEE Chemistry - Solution & Colligative Properties

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Question - 1

1000 gm of I m sucrose solution in water is cooled to - 3.534'C. What weight of ice would be separated out at this temperature?
\(\mathrm{K}_{\mathrm{l}}\left(\mathrm{H}_{\mathrm{z}} \mathrm{O}\right)=1.86 \mathrm{~K} \text { mole kg. }\)

  • A 378.52
  • B 352.98
  • C 342.99
  • D 342.96

Question - 2

The freezing point of an 0.08 (m) NaHSO4 is - 0.345oC. Calculate the percentage of HSO4 ions that transfer a proton to water to form \(\mathrm{SO}_{4}^{2-}\) ion.
K1(H2O) = 1.86 mol 'kg

  • A 31.85
  • B 32.85
  • C 33.85
  • D 34.85

Question - 3

At 10oC, the osmotic pressure of urea solution is 500 mm. The solution is diluted and the temperature is raised to 25oC, when the osmotic pressure is found to be 105.3 mm. Determine extent of diiution (V2/V1)?

  • A 2.00
  • B 3.00
  • C 4.00
  • D 5.00

Question - 4

An organic liquid, Au is immiscible with water. When boiled together with water, the boiling point is 90oC at which the partial vapour pressure of water is 526 mm Hg. The atmospheric pressure is 736 mm Hg. The weight ratio of the liquid and water collected is 2.5: 1. What is the molecular weight of the liquid?

  • A 114.70
  • B 115.70
  • C 113.70
  • D 112.70

Question - 5

A current of dry air i.s 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: (a) relative lowering of vapour pressure _____________ .

  • A 0.01
  • B 0.02
  • C 0.03
  • D 0.04

Question - 6

If boiling point of an aqueous solution is 100oC. What is its freezing point? \(\mathrm{K}_{\mathrm{f}} \text { for } \mathrm{H}_{2} \mathrm{O}=1.86 \mathrm{~K}\)\(\mathrm{kg} / \mathrm{mol}, \mathrm{Kb}=0.513 \mathrm{~K} \mathrm{~kg} / \mathrm{mol}\).

  • A -0.37
  • B -0.36
  • C -0.38
  • D -0.35

Question - 7

1.5g of a monobasic acid when dissolved in 150g of water lowers the freezing point by 0.165oC. 0.5g of the same acid when titrated, after dissolution in water, requires 37.5 ml of N/10 alkali. Calculate the degree of dissociation of the acid (Kffor water = 1.86oC mol-1).

  • A 17.28
  • B 18.28
  • C 19.28
  • D 20.28

Question - 8

Sea water is found to contain 5.85% NaCl and 9.50% MgCl2 be weight of solution. Calculate its normal boiling point assuming 80% ionisation for NaCl and 50% ionisation of MgCl2 [Kb(H2O) = 0.51 kg mole-1K]

  • A 103.98
  • B 100.98
  • C 101.98
  • D 102.98

Question - 9

Calculate the boiling point of a solution containing 0.61g of benzoic acid in 50g of carbon disulphide assuming 84% dimerization of the acid. The boiling point and Kb of CS2 are 46.2oC and 2.3 K kg mol-1, respectively.

  • A 46.33
  • B 47.33
  • C 48.33
  • D 49.33

Question - 10

A decimolar solution of potassium ferrocyanide \(\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\) is 50% dissociated at 300K. Calculate the osmotic pressure of the solution. \(\left(\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}\right)\).Give your anewer as a multiple of 10-5_______________ .

  • A 6.48
  • B 7.48
  • C 8.48
  • D 9.48
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