Question

Why physical adsorption is an endothermic reaction?

Answer 1

Answer:

This causes a decrease in the surface energy of the adsorbent. Therefore, adsorption is always exothermic. ... 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.

Explanation:

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Answer 2

This causes a decrease in the surface energy of the adsorbent. Therefore, adsorption is alwaysexothermic. ... When a gas isadsorbed 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 aprocess to be spontaneous, ΔG should be negative.