What is the sign of H and S when a gas is adsorbed by an adsorbent?



Answer

ΔH  =  Negative [ Decrease in surface energy ]

It is an exothermic process. 


ΔS =  Negative [ Decrease in surface energy ]

The randomness decreases due to the force of attraction between adsorbent and adsorbate due to which the gas molecules adhere to the surface.


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