Question

A particular adsorption process has the following characteristics: (i) It arises due to van der Waals forces and (ii) it is reversible. Identify the correct statement that describes the above adsorption process :

• A. Adsorption is monolayer
• B. Energy of activation in low
• C. Adsorption increases with increase in temperature
• D. Enthalpy of adsorption is greater than $100{\text{kJ mol}}^{-1}$

Answer 1

The correct option is B Energy of activation in low

Physical adsorption process (physisorption has the following characteristics:
(i) It arises due to van der Waals forces and (ii) it is reversible. The Correct statement that describe the above adsorption process is option B. Energy of activation for physisorption is low.
Physisorption is multilayer. It decreases with increase in temperature and the enthalpy of physisorption is low $(20-40\text{kJ/mol})$