Following questions may have more than one correct options.
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
B IV is chemisorption and II is chemisorption
Answer is A ,C .
First graph is related to physisorption and as temperature increases amount of gas adsorbed decreases.
Second graph is related to chemisorption where adsorbed amount first increases and then decreases with the increase in temperature.
Third graph is related to Freundlich Adsorption isotherm at constant temperature.
Fourth graph is related to chemisorption at $Δ H_{a d s} = 150 K J$ is in the range of chemisorption.

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