Question

Which of the following statements is incorrect regarding physisorption?

• A. It occurs because of van der Waal’s forces
• B. Enthaply of adsorption $\left(\Delta H_{adsorption}\right)$ is low and positive
• C. Under high pressure it results into multi molecular layer on adsorbent surface
• D. More easily liquefiable gases are adsorbed readily

Answer 1

The correct option is B Enthaply of adsorption $\left(\Delta H_{adsorption}\right)$ is low and positive

Physisorption is an exothermic process with
$\Delta H\approx -20\frac{kJ}{mol}$