5.2   Why does physisorption decreases with the increase of temperature? 

Answers (1)

Physisorption is an exothermic process:

\underset{(Adsorbent)}{Solid}\:+\:\underset{(Adsorbate)}{Gas}\rightleftharpoons \:Gas adsorbed on solid+Heat

So, therefore, according to Le-Chateliers principle, it decreases with increase in temperature.

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