Question

Adsorption of gas on a solid is always exothermic explain?

Answer 1

(i) Adsorption leads to a decrease in the residual forces on the surface 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.

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Answer 2

Answer:

• Adsorption leads to a decrease in the residual force on the surface of the adsorbent . Therefore adsorption is always exothermic .

• ∆ H of adsorption is always negative . When a gas is adsorbed on a solid surface , it's movement is restricting leading into the decrease in the entropy of the gas ie , ∆ S is negative .