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Which of the following statements is correct for the spontaneous adsorption of a gas?

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a
∆S is negative and, therefore ∆H should be highly positive.
b
∆S is negative and therefore, ∆H should be highly negative.
c
∆S is positive and therefore, ∆H should be negative.
d
∆S is positive and therefore, ∆H should also be highly positive.

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detailed solution

Correct option is B

Using Gibb's - Helmholtz equation, ∆G = ∆H - T∆SDuring adsorption of gas, entropy decreases i.e., ∆S<0For spontaneous adsorption, ∆Gshould be negative, which is possible when ∆H is highly negative.

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