Why is the adsorption of a gas on a solid exo | vedclass

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(A) Adsorption is a spontaneous process where gas molecules are trapped on the surface of a solid. According to the Gibbs free energy equation,$\Delta

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Decrease in entropy.

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(A) Adsorption is a spontaneous process where gas molecules are trapped on the surface of a solid. According to the Gibbs free energy equation,$\Delta G = \Delta H - T\Delta S$. For a spontaneous process,$\Delta G$ must be negative. During adsorption,the freedom of movement of gas molecules decreases,leading to a decrease in entropy $(\Delta S Since $-T\Delta S$ becomes positive,for $\Delta G$ to be negative,the enthalpy change $(\Delta H)$ must be negative (exothermic).

Why is the adsorption of a gas on a solid exothermic?

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