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  4. Which of the following is not a characteristic of chemisorption ?

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Q. Which of the following is not a characteristic of chemisorption ?

ManipalManipal 2004Surface Chemistry

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.