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Question

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

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
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 kJ mol1). Thus,physysorption is an exothermic process.
  • Hence, both assertion and reason are incorrect.

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