Assertion:- Azeotropic mixture can not be separated by fractional distillation.

Reason:- Azeotropic mixtures are constant boiling mixtures.

Assertion:- ${\mathrm{\Delta H}}_{\mathrm{mix}}$and ${\mathrm{\Delta V}}_{\mathrm{mix}}$ for the preparation of ideal solution is zero.

Reason :- $\mathrm{A}-\mathrm{B}$ interactions in ideal solution are same as between $\mathrm{A}-\mathrm{A}$ and $\mathrm{B}-\mathrm{B}$ in the two liquids before mixing.

Assertion:- $0.1 \mathrm{M}$ solution of $\mathrm{NaCl}$ have low freezing point than $0.1\mathrm{M}$ urea solution.

Reason:- Van't Hoff factor (No. of particles) for $\mathrm{NaCl}$ is more than urea.

Assertion:- On mixing aniline and Acetone shows $+\mathrm{ve}$ deviation.

Reason: - Interaction between Acetone and aniline is weaker than interaction of Acetone-Acetone and aniline-aniline.

Assertion:- When two volatile liquids are mixed then vapour pressure of one increases and other decreases.

Reason:- Vapour pressure of solution decreases.

Assertion:- After adding non-volatile solute freezing point of solvent depressed.

Reason:- Vapour pressure of solvent decreases and become equal to solid solvent, at temprature lower than the freezing point of pure solvent.

Assertion: On increasing pressure solubility of gases in liquid solvent increases.

Reason: Dissolution of gases in liquid is exothermic.