Question

For a non-volatile solute

• A. The vapour pressure of a solute is zero.
• B. Vapour pressure of solution=Vapour pressure of solvent.
• C. Vapour pressure of solution=Vapour pressure of solvent in solution.
• D. All of the above.

Answer 1

Answer: (A), (C)

The vapour pressure of a solute is zero.
Vapour pressure of solution=Vapour pressure of solvent in solution.

A non-volatile solute has a low tendency to escape as vapour from a solution.

Its vapour pressure is very less or negligible than the vapour pressure of the solvent.

Hence, the vapour pressure of solute is zero as no solute particles are going in the vapour phase.

Vapour pressure of solution = vapour pressure of solvent in solution + vapour pressure of Solute

From 1st conclusion, vapour pressure of Solute = 0

Hence,

Vapour pressure of solution = vapour pressure of solvent in solution

Hence, the correct options are $\text{A}$ and $\text{C}$