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JEE CHEMISTRY MCQ: SURFACE CHEMISTRY
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Assertion (A): Chemical adsorption increases with increase in temperature and later it decreases.
Reason (R): Physical adsorption decreases with increase in temperature.
Reason (R): Physical adsorption decreases with increase in temperature.
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Correct option: A
Both (A) and (R) are true and (R) is the correct explanation of (A)
Option A is correct because chemical adsorption (chemisorption) initially increases with temperature as it requires activation energy, but later decreases due to the exothermic nature of adsorption, and physical adsorption (physisorption) decreases with increasing temperature due to weaker van der Waals forces.
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