Question

Which of the following(s) is/are true for chemical adsorption?

• A. It forms multimolecular layers on adsorbent
• B. It is irreversible
• C. It is reversible
• D. It involves high activation energy

Answer 1

Answer: (B), (D)

It involves high activation energy

In chemisorption, gas molecules or atoms of the adsorbate are held to the solid surface of the adsorbent by the chemical bonds.​
Chemical bonds may be ​covalent or ionic in nature.

Since, chemisorption leads to a new compound formation at the surface of solids, it needs a high activation energy for it.

As chemisorption involves compound formation​, it is generally a irreversible process.

Generally, chemisorption occurs at high temperature and leads to monolayer adsorption

Thus, statements (b) and (d) are correct.