Which of the following statements is incorrect regarding physisorptions?

Physisorption arises because of van der Waal's forces between adsorbent and adsorbate molecules. It results in a multimolecular layer on the adsorbent surface under high pressure. It has also low $\Delta H_{\text{adsorption }}$ of about

$-20$ to $-40 kJ$ per mole.

Also due to the presence of weak intermolecular forces they are easily liquefiable.

Thus, it is clear from the above that its $\Delta H_{\text{adsorption }}$ is negative and low.

Hence, option (C) is the correct option.