A) Adsorption is specific
B) Adsorption is irreversible
C) \[\Delta H\]is of the order of 400 kJ
D) Adsorption may be multimolecular layer
Correct Answer: D
Solution :
Chemisorption (chemical adsorption) has following characteristics: 1. Irreversible 2. Very specific 3. Leads almost to a monolayer adsorption. 4. Generally has heat of adsorption greater than about 20 kcal/mol. 5. May involve activation energy in the adsorption process. 6. Appreciable at high temperatures. Hence, option [d] is correct as chemical adsorption is always monolayer or unimolecular layer.
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