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

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Physisorption may transform into chemisorption at high temperature.

Physisorption increases with increasing temperature but chemisorption decreases With increasing temperature.

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

Adsorption is always exothermic.

answer is A, B, D.

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Detailed Solution

(A) Adsorption always produces heat. Adsorption basically refers to the attraction of adsorbate molecules to an adsorbent surface. Because the surface is energetically homogenous, molecules that are adsorbed do not interact.

(B) High temperatures can cause physisorption to change into chemisorption because they give the reaction's energy a boost.

(C) Because chemisorption includes the production of chemical bonds, it increases as temperature rises, whereas physical sorption decreases.

(D) Chemisorption is more exothermic than physisorption, although it moves much more slowly since the activation energy is larger. When chemisorption occurs, chemical bonds are formed between the adsorbate and adsorbent in a monolayer, frequently releasing heat that is much greater than the heat of condensation. In general, chemisorption from a gas only occurs at higher temperatures.

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