Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Which of the following statement is correct for the spontaneous absorption of a gas?
A
is negative and therefore, 
should be highly positive. B
is negative and therefore, 
should be highly negative. C
is positive and therefore, 
should be negative. D
is positive and therefore, 
should also be highly positive.
Text Solution
Verified by ExpertsThe correct answer is:
B
(change in entropy) and 
(change in enthalpy) are related by the equation 
[Here, 
change in Gibbs free energy] For adsorption of a gas, 
is negative because randomness decreases due to association between adsorbate and adsorbent. Thus, in order to make 
negative (for spontaneous reaction), 
must be highly negative. Hence for the adsorption of a gas, if 
is negative, therefore, 
should be highly negative.
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