Question

When a volatile liquid is introduced into an evacuated closed vessel at a particular temperature, both evaporation and condensation take place simultaneously. The system reaches equilibrium state when:

• A. the liquid is completely transformed into the corresponding vapour
• B. equal amounts of liquid and vapour are present in the system
• C. the rate of evaporation becomes equal to the rate of condensation
• D. liquid cannot be converted into vapour and vice versa.

Answer 1

Answer: (C)

the rate of evaporation becomes equal to the rate of condensation

Solution:- (C) The rate of evaporation becomes equal to the rate of condensation

As we know that the equilibrium in a system is established when rate of forward reaction is equal to the rate of backward reaction.

Hence the rate of evaporation becomes equal to the rate of condensation.