MEDIUMMCQ SINGLEJEE Advanced 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.