Q.

Which one of the following characteristics is associated with adsorption?

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ΔG and ΔH are negative but ΔS is positive.

ΔG and ΔS are negative but ΔH is positive.

ΔG is negative but ∆H and ΔS is positive.

ΔG, ΔH and ∆S all are negative

answer is 4.

(Detailed Solution Below)

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Detailed Solution

As the molecules of the adsorbate are held on the surface of the solid adsorbent, entropy decreases i.e.,∆S=-ve. As ΔG=ΔH-TΔSFor the adsorption to occur, ∆G=-ve and it is possible only if ∆H=-ve

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