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The correct statement(s) pertiaining to the adsorption of a gas on a solid surface is (are)

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Physisorption may transform into chemisorption at high temperature

Adsorption is always exothermic

Chemisorption is more exothermic than physisorption, however it is very slow due to higher energy of activation

Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature

answer is A, B, D.

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Detailed Solution

$(a) Δ H = - v e$ for adsorption

$(b) Fact$

(d) Chemical bonds are stronger than vander waal's forces so chemical adsorption is more exothermic.

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