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Question

Adsorption of gas on solid is accompanied by:

A
Decrease in entropy of the system
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B
Decrease in enthalpy of the system
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C
Decrease in free energy of system
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D
No change in free energy of system
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Solution

The correct option is C Decrease in free energy of system
As adsorption is exothermic process, it leads to a decrease in the residual force on the surface of the adsorbent. This cause a decrease in the surface energy of the adsorbent.
When gas adsorbed on the surface of solid, entropy decreases as when a gas is adsorbed, the freedom of movement of its molecules become restricted i.e., ΔS=ve. For a process to be spontaneous, ΔG must be negative. Since ΔS=ve, ΔH must be negative.

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