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Solutions · Question 44

AIPMT 2006MCQMedium📈 Topic in 25% papers+4−1
1

A solution containing 10 g per dm3 of urea (molecular mass = 60 g mol-1) is isotonic with a 5% solution of a nonvolatile solute. The molecular mass of this nonvolatile solute is

  1. 200 g mol-1
  2. 250 g mol-1
  3. 300 g mol-1
  4. 350 g mol-1

Answer

(3) 300 g mol-1

Solution

∵ Isotonic solutions have the same osmotic pressure, = CRT ⇒ C1 = C2

Urea: C1 = 1060 1 mol L-1 = 16 mol L-1

5% (w/v) solution: 5 g in 100 mL = 50 g in 1 L ⇒ C2 = 50M mol L-1

⇒ 50M = 16

∴ M = 300 g mol-1

Answer: (3)

AIPMT 2006

Keep practising — Solutions

2

The mole fraction of the solute in one molal aqueous solution is

  1. 0.009
  2. 0.018
  3. 0.027
  4. 0.036
AIPMT 2005
3

The vapour pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mole of Q would be

  1. 72 torr
  2. 140 torr
  3. 68 torr
  4. 20 torr
AIPMT 2005
4

A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressures of the pure hydrocarbons at 20 are 440 mm Hg for pentane and 120 mm Hg for hexane. The mole fraction of pentane in the vapour phase would be

  1. 0.200
  2. 0.549
  3. 0.786
  4. 0.478
AIPMT 2005
5

A solution of urea (mol. mass 60 g mol-1) boils at 100.18 at the atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 K kg mol-1 respectively, the above solution will freeze at

  1. 0.654
  2. -0.654
  3. 6.54
  4. -6.54
AIPMT 2005
6

Formation of solution from two components can be considered as (i) Pure solvent separated solvent molecules, H1 (ii) Pure solute separated solute molecules, H2 (iii) Separated solvent and solute molecules solution, H3 Solution so formed will be ideal if

  1. Hsoln = H1 + H2 + H3
  2. Hsoln = H1 + H2 - H3
  3. Hsoln = H1 - H2 - H3
  4. Hsoln = H3 - H1 - H2
AIPMT 2003
7

A solution containing components A and B follows Raoult's law when

  1. A-B attraction force is greater than A-A and B-B
  2. A-B attraction force is less than A-A and B-B
  3. A-B attraction force remains same as A-A and B-B
  4. volume of solution is different from sum of volumes of solute and solvent
AIPMT 2002
8

A solution contains non-volatile solute of molecular mass M2. Which of the following can be used to calculate the molecular mass of solute in terms of osmotic pressure?

  1. M2 = ( m2 )VRT
  2. M2 = ( m2V ) RT
  3. M2 = ( m2V ) RT
  4. M2 = ( m2V ) RT
AIPMT 2002
9

Pure water can be obtained from sea water by

  1. centrifugation
  2. plasmolysis
  3. reverse osmosis
  4. sedimentation
AIPMT 2001
10

From the colligative properties of solution, which one is the best method for the determination of molecular weight of proteins and polymers?

  1. Osmotic pressure
  2. Lowering in vapour pressure
  3. Lowering in freezing point
  4. Elevation in boiling point
AIPMT 2000

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