MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryThermodynamics and ThermochemistryPrevious Year Questions

Which of the following statements is correct for the spontaneous adsorption of a gas? (2014)

A.∆S is negative and, therefore ∆H should be highly

B.∆S is negative and therefore, ∆H should be highly✓ Correct

C.∆S is positive and therefore, ∆H should be negative.

D.∆S is positive and therefore, ∆H should also be

Explanation

Using Gibbs’-Helmholtz equation, ∆G = ∆H – T∆S During adsorption of a gas, entropy decreases i.e. ∆S < 0 For spontaneous adsorption, ∆G should be negative, which is possible when ∆H is highly negative.

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