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Question

In which condition, adsorption will not take place?

A
When ΔH is negative
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B
When ΔH is positive ΔS is positive
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C
When ΔH is positive and ΔS is negative
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D
When ΔG is negative.
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Solution

The correct option is D When ΔH is positive and ΔS is negative
Adsorption takes place only when ΔG<0 i.e. ΔHTΔS<0.
So, if ΔH is positive and ΔS is negative then ΔHTΔS will always be positive. So adsorption will not take place.

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