Question

Choose the correct statement(s) regarding distillation:

• A. The compositions of the liquid and the vapour that are in mutual equilibrium are same.
• B. In condensate, there is higher mole fraction of the less volatile component
• C. In fractional distillation, the boiling and condensation cycle is repeated successively to get a distillate.
  
• D. The vapour should be richer in the more volatile component

Answer 1

Answer: (C), (D)

The vapour should be richer in the more volatile component

Application of raoult's law:
Distillation:
The compositions of the liquid and the vapour that are in mutual equilibrium are not necessarily the same.The vapour should be richer in the more volatile component.
In condensate, there is higher mole fraction of the more volatile component
In residue,there is higher mole fraction of the less volatile component
This is the principle of distillation and is used to separate a more volatile liquid from a less volatile liquid.

In fractional distillation, the boiling and condensation cycle is repeated successively to get a distillate which gets richer in the more volatile component after each cycle.