Question

Which of the following statements is incorrect regarding physissorptions?

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

Answer 1

Answer: (C)

Enthalpy of adsorption ($\Delta$Hadsorption) is low and positive.

Answer 2

Since adsorption is exothermic process so $\Delta$H of adsorption is always negative.