Question

Assertion :At equilibrium of $Liquid\rightleftharpoons Vapour$, kinetic energy of liquid phase and vapour phase is same. Reason: Kinetic energy of liquid or vapour is given by $\frac{3}{2}RT$ for 1 mole.

Choose the correct option.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Evaporation is a phase transition from the liquid phase to the gas phase that occurs at temperatures below the boiling point at a given pressure.

For molecules of a liquid to evaporate, they must be located near the surface, be moving in the proper direction and have sufficient kinetic energy to overcome liquid-phase intermolecular forces.

At equilibrium, both the liquid and gas will have the same kinetic energy. For $1$ mole, kinetic energy for liquid vapour can be given as $1.5RT$.

Both assertion and reason are correct and the reason is the correct explanation for the assertion.