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Adsorption of a gas on the surface of so...

Adsorption of a gas on the surface of solid is sgenerally accompanied by decrease in entropy but still it is spontaneous in naturre. Explain.

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Actually adsorption is of exothermic nature and `DeltaH` is negative. Since entropy `(DeltaS)` decreases, `TDeltaS` is also negative at a given temperature, the magnitude of `DeltaH` (favourable factor) is generally more than that of opposing factor `(TDeltaS).` As a result, free energy `(DeltaG)` is also negative or adsorption is of exothermic nature.
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