Assertion :Physical adsorption increases with increase in temperature. Reason: Physical adsorption is an endothermic process.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
If the accumulation of gas on the surface of a solid occurs on account of weak van der Waals’ forces, the adsorption is termed as physical adsorption or physisorption.
It is not specific in nature.
It is reversible in nature.
Low temperature is favourable for adsorption. It decreases with an increase in temperature.
Enthalpy of adsorption is low (20-40 $k J$ $m o l^{- 1}$ ). Thus,physysorption is an exothermic process.
Hence, both assertion and reason are incorrect.

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