JEE Main · 2023 · 12 Apr 2023 · Shift 1 · Surface Chemistry

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Four gases A, B, C and D have critical temperatures 5.3, 33.2, 126.0 and 154.3 K respectively.
For their adsorption on fixed amount of charcoal, the correct order is :

(A)C > B > D > A
(B)C > D > B > A
(C)D > C > A > B
(D)D > C > B > A✓ Correct

Answer: (D)

Solution

The extent of adsorption is directly proportional to the critical temperature of the gas. Higher critical temperature means stronger intermolecular forces, leading to greater adsorption on the charcoal surface. Arranging the gases by decreasing critical temperature: D (154.3 K) > C (126.0 K) > B (33.2 K) > A (5.3 K). Therefore, the correct order of adsorption is D > C > B > A.

JEE Main · 2023 · 12 Apr 2023 · Shift 1 · Single correct option

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