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The incorrect statement pertaining to the adsorption of a gas on a solid surface is

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Adsorption is always exothermic

Physisorption may transform into chemisorption at high temperature

The extent of physisorption as well as chemi-sorption increases with increase in temperature

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

answer is C.

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Detailed Solution

The extent of physisorption decreases with increase in temperature as adsorption is accompanied by release of heat where as that of chemisorptions increases with temperature initially and then decreases with increase in temperature

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