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Adsorption, if spontaneous, is exothermi...

Adsorption, if spontaneous, is exothermic. Explain.

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Adsorption is accompanied by decrease in entropy, i.e.,
`DeltaS=-ve` . If it is spontaneous than `DeltaG` should be negative
`DeltaG=DeltaH-TDeltaS` .
Since `DeltaS` is -ve (entropy decreases in the process of adsorption), `deltaG` will be negative, only if `DeltaH=-ve` , i.e., if the process is exothermic.
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