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Sponetaneous adsorption of a gas on soli...

Sponetaneous adsorption of a gas on solid surface is an exothermic process because

A

`DeltaH` increases for system.

B

`DeltaS` increases for gas.

C

`DeltaS` decreases for gas.

D

`DeltaG` increases for gas.

Text Solution

Verified by Experts

`DeltaG = DeltaH - T DeltaS`
Entropy decreases during adsorption. Entropy factor is disfavouring, therefore the enthalpy factor must factor spontaneity, so it must be exothermic and `DeltaH` must be negative.
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