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Question

For Adsorption phenomenon:

A
ΔH=+ve,ΔS=ve
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B
ΔH=ve,ΔS=+ve
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C
ΔH=ve,ΔS=ve
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D
ΔH=+ve,ΔS=+ve
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Solution

The correct option is D ΔH=ve,ΔS=ve

Adsorption leads to a decrease in the residual forces on the surface of the adsorbent. This causes a decrease in the surface energy of the adsorbent. Therefore, adsorption is always exothermic and ΔH is negative.

And for reaction to occur ΔG should be negative so by equation ΔG=ΔHTΔS, ΔS should be negative.


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