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?

I is physisorption and II is chemisorption

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I is physisorption and III is chemisorption

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IV is chemisorption and II is chemisorption

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IV is chemisorption and III is chemisorption

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Solution

The correct options are
A I is physisorption and II is chemisorption
C IV is chemisorption and II is chemisorption
Graphs $I$ and $I I I$ represent physisorption because in physisorption, the amount of adsorption decreases with the increase in the temperature and increases with the increase of pressure.

Graph $I I$ represents chemisorption because in chemisorption, the amount of adsorption increase with the increase in temperature.
Graph $I V$ shows the formation of a chemical bond. Hence, it shows chemisorption.

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