During the adsorption of a gas on the surface of a solid, which of the following is true?

Δ G < 0, Δ H > 0, Δ S < 0

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Δ G > 0, Δ H < 0, Δ S < 0

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Δ G < 0, Δ H < 0, Δ S < 0

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Δ G < 0, Δ H < 0, Δ S > 0

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Solution

The correct option is C $Δ G < 0, Δ H < 0, Δ S < 0$
During the adsorption of a gas on the surface of a solid, the following is true.
Adsorption is spontaneous process therefore change in free energy is negative $(Δ G < 0)$ .
It is an exothermic process. Hence, the enthalpy change is negative.
$Δ H < 0$ .
The adhering of gas molecules to the surface lowers the randomness.
$Δ S < 0$ .

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