Answer 1

Physisorption is exothermic in nature:

Solid        +       Gas        ⇌        Gas/Solid + Heat

(Adsobent) (Adsobate)         (Gas adsorbed on solid)

In accordance with Le Chatelier’s principle, physisorption decreases with an increase in temperature. Because the equilibrium will shift in the backward direction, gas will be released from the adsorbed surface.