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.