Which of the following statement is incorrect regarding physisorption?

Options

A. More easily liquefiable gases are adsorbed readily.
B. Under high high pressure it results into multi molecular layer on adsorbent surface
C. Enthalpy of adsorption `(DeltaH_("adsorption"))` is low and positive
D. It occurs because of van der Waal's forces

Answer

C

Explanation

Since adsorption is exothermic process so `DeltaH` of adsorption is always negative.