The correct statement(s) pertaining to the adsorption of a gas on a solid surface is (are)

A

Adsorption is always exothermic

B

Physiosorption may transform into chemisorption at high temperature

C

Physiosorption increases with increasing temperature but chemisorption decreases with increasing temperature

D

Chemisorption is more exothermic than physiosorption, however it is very slow due to higher energy of activation