Practicing Success

Target Exam

CUET

Subject

Chemistry

Chapter

Physical: Solutions

Question:

Which of the following is true when a non-volatile solute is added to a volatile solvent?

Options:

V.P. of solvent decreases

V.P of solution formed is always less than V.P. of pure solvent

V.P of solution formed is always more than V.P. of pure solvent

Both (1) and (2)

Correct Answer:

Both (1) and (2)

Explanation:

When a non-volatile solute is added to a volatile solvent, its vapour pressure gets lowered because percentage surface area occupied by solvent molecules decreases. Hence rate of evaporation and vapour pressure decreases, because solute molecules occupy some surface.