Account for the following: Adsorption of a gas on the surface of a solid is generally accompanied by a decrease in entropy, still it is a spontaneous process.
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Adsorption of a gas is a spontaneous process as ∆G is -ve value. ∆G=∆H-T∆S where ∆S is -ve it becomes∆G = ∆H + T∆S but here ∆H decreases and becomes -ve therefore. as ∆H is more negative than T∆S and ∆G becomes negative. thus spontaneous process is accompanied by decrease in Gibbs free energy that is ∆G= -ve. therefore it is spontaneous process
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