Adsorption is aways exothermic.

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Adsorption is aways exothermic.

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JackTerrance · Answer 1 · 2022-01-03T02:24:24+0000

When a gas is adsorbed on the surface of a solide, its entropy decreases, i.e.,ΔS is -ve . Now ΔS=ΔH-TΔS and for the process to be spontaneous, free energy change, ΔG , must be negative. As TΔS is -ve , therefore, ΔG can be -ve only if ΔH is -ve . Hence, adsorption is always exothermic.