The adsorption of a gas on the surface of a s | vedclass

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(C) Adsorption is a surface phenomenon where gas molecules are trapped on the surface of a solid.
When gas molecules are adsorbed,their freedom of mo

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Entropy decreases

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(C) Adsorption is a surface phenomenon where gas molecules are trapped on the surface of a solid.
When gas molecules are adsorbed,their freedom of movement is restricted,which leads to a decrease in the entropy of the system $(\Delta S < 0)$.
According to the Gibbs free energy equation,$\Delta G = \Delta H - T\Delta S$.
For a spontaneous process,$\Delta G$ must be negative.
Since $\Delta S$ is negative,the term $-T\Delta S$ becomes positive.
To make $\Delta G$ negative,the enthalpy change $(\Delta H)$ must be negative (exothermic),and its magnitude must be greater than the magnitude of $T\Delta S$.
Therefore,the decrease in entropy is the primary reason why the process is exothermic.

The adsorption of a gas on the surface of a solid is generally an exothermic process because ......

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