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Question

Which of the following is applicable to the phenomenon of adsorption ?

A
ΔS>0
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B
ΔS<0
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C
ΔS=0
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D
All of the above
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Solution

The correct option is B ΔS<0
The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed adsorption.
When a gas is adsorbed, the freedom of movement of its molecules become restricted. This amounts to decrease in the entropy of the gas after adsorption, i.e., ΔS is negative.
ΔS=ve

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