Question

Point out the wrong statement: Physical adsorption is characterised by

• A. Attraction due to weak Vander Waal's forces
• B. Irreversible nature of adsorption
• C. Multimolecular adsorption layers
• D. Decrease in adsorption with increase in temperature

Hint:

Physical adsorption is usually reversible, weak, and forms multiple layers. Irreversibility indicates chemisorption.

Answer 1

The Correct Option is B

• Physical adsorption is due to weak Van der Waal’s forces, making it a reversible process.
• It generally forms multilayer adsorption and decreases with an increase in temperature.
• Therefore, stating that it is "irreversible" is incorrect — that property is characteristic of chemical adsorption.