Adsorption, if spontaneous, is exothermic. – InterviewSolution

1.	Adsorption, if spontaneous, is exothermic.
Answer» Solution :Adsorption is ACCOMPANIED by DECREASE in entropy i.e., `DeltaS = -ve`. If it is spontaneous, `DELTAG` should be negative. `DeltaG = DeltaH - TDeltaS` SINCE `DeltaS` is negative (entropy decreases in the process of adsorption), `DeltaG` will be negative only if `DeltaH` is negative. That means the process will be EXOTHERMIC.

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