Questions
Which one of the following characteristics is associated with adsorption?
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a
ΔG and ΔH are negative but ΔS is positive.
b
ΔG and ΔS are negative but ΔH is positive.
c
ΔG is negative but ∆H and ΔS is positive.
d
ΔG, ΔH and ∆S all are negative
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Correct option is D
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=-veSimilar Questions
Which are not purely surface phenomena?
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