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Adsorption is accompanied by :...

Adsorption is accompanied by :

A

decrease in enthalpy and increase in entropy.

B

increase in enthalpy and increase in entropy

C

decrease in enthalpy and decrease in entropy

D

increase in enthalpy and decrease in entropy

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The correct Answer is:
C
Adsorption is an exothermic process i.e. `DeltaH` of adsorption is always negative. When a gas is adsorbed the freedom of movement of its molecules becomes v restricted i.e. `DeltaS` is negative. Hence adsorption accompanied by decrease in enthalpy as well as decrease in entropy of the system.
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DISHA PUBLICATION-SURFACE CHEMISTRY-Exercise-1 : Concept Builder (TOPICEWISE)
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