Assertion :For adsorption, $Δ G, Δ H$ and $Δ S$ all have negative values. Reason: Adsorption is a spontaneous exothermic process in which randomness decreases due to force of attraction between adsorbent and adsorbate.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.

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Assertion is correct, but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
For adsorption, $Δ G, Δ H, Δ S$ all have negative values. Adsorption is a spontaneous process.
Hence, $Δ G$ is negative.
It is an exothermic process.
Hence, $Δ H$ is negative.
The randomness decreases due to the force of attraction between adsorbent and adsorbate due to which the gas molecules adhere to the surface.
Hence, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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