Assertion :Adsorption is exothermic and spontaneous inspite of the fact that adsorption is accompained with decrease in entropy. Reason: The factor $T Δ S$ is lesser than $Δ H$ .

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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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Adsorption involves attracting molecules of adsorbate on surface of the adsorbent. Due to this, energy is released and thus, heat of adsorption is negative, i.e., adsorption is always exothermic.
$Δ S$ is -ve because adsorption leads to more ordered arrangement.
Thus, $Δ G = Δ H - T Δ S; Δ G = - v e$ only when $Δ H > T Δ S$ .

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