Which of the following represents the primary physical reason for the universally exothermic nature — Surface Chemistry Chemistry Question

💡 Solution & Explanation

The surface particles of an adsorbent exist in a state of strain due to unbalanced or residual attractive forces. When adsorbate molecules attach to the surface, these residual forces are partially satisfied and decrease. This fundamental decrease in surface energy manifests as a release of heat, making the process exothermic.