Statement I : For adsorption Δ G , Δ H , Δ S all have negative values. Statement II : Adsorption is an exothermic process in which randomness decreases due to force of attraction between adsorbent and

Question

Statement I : For adsorption Δ G , Δ H , Δ S all have negative values. Statement II : Adsorption is an exothermic process in which randomness decreases due to force of attraction between adsorbent and adsorbate.

TestHub · Accepted Answer

II is correct explanation of I as adsorption leads to arrangement i.e., decreases randomness $(∴ Δ S = - ve)$ at the same time energy is released due to attraction between adsorbate and adsorbent $(∴ Δ H = - ve)$ .

Adsorption is a spontaneous process as it occurs on its own. For all spontaneous processes, the change in free energy is negative. Or,

$∴ Δ G = - ve$

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