Solutions Quiz 4 – Punjab Meritorious School Preparation Portal

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The vapour pressure of a solvent decreases by 10 mm of Hg when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent if the decrease in the vapour pressure is to be 20 mm of Hg?

0.8

0.6

0.4

0.2

Which of the following aqueous solution has minimum freezing point?

0.01 m NaCl

0.005 m C2H5OH

0.005 m MgI2

0.005 m MgSO4

The molal elevation constant is the ratio of elevation in boiling point to:

molality

mole fraction

molarity

none

When a hard-boiled egg after shelling is immersed in saturated brine:

it shrinks

it grows is size

its size remains unchanged

it initially grows in size and then shrinks

A solution of acetone in ethanol

shows a positive deviation from Raoult’s law

behaves like a non ideal solution

obeys Raoult’s law

shows a negative deviation from Raoult’s law

The azeotropic mixture of water (b.p.100 °C) and HCl (b.p.85 °C) boils at 108.5 °C. When this mixture is distilled it is possible to obtain

Which will form maximum boiling point azeotrope

Azeotropic mixture of water and HCl has the percentage of HCl.

20.2 %

26.4 %

48 %

68 %

The molar freezing point constant for water is 1.86 °C/mol. If 342 g of cane sugar (C₁₂H₂₂O11) is dissolved in 1000 g of water, the solution will freeze at:

– 1.86 °C

1.86 °C

– 3.92 °C

2.42 °C

The vapour pressure at a given temperature of an ideal solution containing 0.2 mol of a non-volatile solute and 0.8 mol of solvent is 60 mm of Hg. The vapour pressure of the pure solvent at the same temperature is

150 mm of Hg

60 mm of Hg

75 mm of Hg

120 mm of Hg

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