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Q.

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

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a

Adsorption is always exothermic

b

Physisorption may transform into chemisorption at high temperature

c

Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature

d

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

answer is A.

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Detailed Solution

(1) Since, ΔG<0,ΔS<0 Hence, ΔH<0. Thus, correct. (2) At high temperature, desorption may start and thus physisorption may change to chemisorption. Thus, correct.(3) (4) ΔH<0. Thus, correct.
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