Question

The given graphs / data I, II, III and IV represent general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure. Which of the following choice(s) about I, II, III and IV is (are) correct?

• A. I is physisorption and II is chemisorption
• B. I is physisorption and III is chemisorption
• C. IV is chemisorption and II is chemisorption
• D. IV is chemisorption and III is chemisorption

Answer 1

Answer: (A), (C)

Graph (I) and (III) represent physiosorption because, in physiosorption, the amount of adsorption decreases with the increase of temperature and increases with the increase of pressure.

Graph (II) represent chemisorption, because in chemisorption amount of adsorption increase with the increase of temperature. Graph (IV) is showing the formation of a chemical bond, hence chemisorption.