NEET 2001 Chemistry question

Not in JEE Main or NEET syllabus

Which is not correct regarding the adsorption of a gas on surface of solid: -

(1)On increasing temp. adsorption increase continuouslyCorrect
(2)Enthalpy & entropy change is Ve
(3)Adsorption is more for some specific substance
(4)Reversible

Answer: (1)

Solution

Adsorption of a gas on a solid is exothermic () and is accompanied by a decrease in randomness of the gas molecules (), so (2) is correct. It is selective (specific gases are adsorbed more on a given adsorbent, (3)) and, for physical adsorption, reversible (4). According to

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Question ID VK-088813