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5/30 MCQs for:

Raoult’s Law And Phase Equilibria

The maximum pressure that a liquid would exert in equilibrium with its vapour at a specified temperature is known as:

Standard pressure.

Liquid pressure.

Saturated vapour pressure.

Vapour pressure.

Two liquids X and Y which form an ideal mixture are mixed in the molar ratio 3 : 1. At 25 °C the vapour pressure of pure X and Y are 10000 Pa and 5000 Pa respectively. What is the vapour pressure of the mixture at 25 °C?

7500 Pa.

8750 Pa.

6250 Pa.

1250 Pa.

On the basis of information given below mark the correct option. On adding acetone to methanol some of the hydrogen bonds between methanol molecules break.

At specific composition methanol-acetone mixture forms maximum boiling azeotrope and will show positive deviation from Raoult’s law.

At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show positive deviation from Raoult’s law.

At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show negative deviation from Raoult’s law.

At specific composition methanol-acetone mixture will form maximum boiling azeotrope and will show negative deviation from Raoult’s law.

If two liquids A and B form minimum boiling azeotrope at some specific composition then.

Vapour pressure of solution decreases because less number of molecules of only one of the liquids escape from the solution.

A–B interactions are stronger than those between A–A or B–B.

A–B interactions are weaker than those between A–A or B–B.

Vapour pressure of solution remains the same because more number of molecules of liquids A and B can escape from the solution.

Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult’s law?

Chloroform and acetone.

Methanol and acetone.

Phenol and aniline.

Nitric acid and water.