Q.

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.

answer is B.

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Detailed Solution

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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