Class 12 Chemistry - Chapter Surface Chemistry NCERT Solutions | Why is adsorption always exothermic?

Welcome to the NCERT Solutions for Class 12th Chemistry - Chapter Surface Chemistry. This page offers a step-by-step solution to the specific question from Exercise 2, Question 8: why is adsorption always exothermic....
Question 8

Why is adsorption always exothermic?

Answer

Adsorption is always exothermic. This statement can be explained in two ways.

(i) Adsorption leads to a decrease in the residual forces on the surface of the adsorbent. This causes a decrease in the surface energy of the adsorbent. Therefore, adsorption is always exothermic.

(ii) ΔH of adsorption is always negative. When a gas is adsorbed on a solid surface, its movement is restricted leading to a decrease in the entropy of the gas i.e., ΔS is negative. Now for a process to be spontaneous, ΔG should be negative.

ΔG = ΔH - TΔS

Since ΔS is negative, ΔH has to be negative to make ΔG negative. Hence, adsorption is always exothermic.

Popular Questions of Class 12 Chemistry

3 Comment(s) on this Question

Write a Comment: