Question

Which of the following is not a characteristic of chemisorption?

• A. It is irreversible.
• B. It is specific.
• C. It is a multi-layer phenomenon.
• D. Heat of adsorption is about $-400$ kJ.

Answer 1

Answer: (C)

It is a multi-layer phenomenon.

Chemisorption is irreversible in nature and highly specific. It occurs only when there is bond formation between adsorbent and adsorbate molecules.

It has a high enthalpy of adsorption of the order of $40$ to $400$ kJ/mol. It forms a mono-molecular layer.

Hence, option C is not a characteristic of chemisorption.

Hence, the correct option is C.