JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Statement 1: The molecules on the surface have lesser energy. Statement 2: During adsorption, the surface of a solid is in a state of relaxation.

(A)Assertion is True, Reason is True; Reason is correct explanation for Assertion
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is TrueCorrect

Answer: (D)

Solution

Molecules at the surface of a solid have unbalanced (residual) attractive forces on one side and so actually possess higher, not lesser, surface energy than molecules in the bulk, making Statement 1 false. When gas molecules are adsorbed on the surface,

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Question ID VK-144811