Question

When a substance is dissolved in a solvent the vapour pressure of the solvent is decreased. This results in.

• A. An increase in the b.p. of the solution
• B. A decrease in the b.p. of the solvent
• C. The solution having a higher freezing point than the olvent
• D. The solution having a lower osmotic pressure than the solvent

Answer 1

Answer: (A)

An increase in the b.p. of the solution

Answer 2

Vapour pressure ∝ $\frac { 1 } { \text { Boiling point } }$

When vapour pressure decreases then b.pt. increases.