Given | Gas: | $\mathrm{H}_{2}$ | $\mathrm{CH}_{4}$ | $\mathrm{CO}_{2}$ | $\mathrm{SO}_{2}$ | |------|----------|-----------|-----------|----------| | Critical Temp/K: | 33 | 190 | 304 | 630 | On the basis of data given, predict which of the following gases shows least adsorption on a definite amount of charcoal

JEE Main · 2019 · 12 Jan 2019 · Shift 1 · Surface Chemistry

Given

Gas:	$H_{2}$	$CH_{4}$	$CO_{2}$	$SO_{2}$
Critical Temp/K:	33	190	304	630

On the basis of data given, predict which of the following gases shows least adsorption on a definite amount of charcoal

(A) $SO_{2}$
(B) $CH_{4}$
(C) $CO_{2}$
(D) $H_{2}$ ✓ Correct

Answer: (D)

Solution

The amount a gas is adsorbed on charcoal tracks how easily it can be liquefied, which is measured by its critical temperature: the higher the critical temperature, the stronger the intermolecular attractions and the more it is adsorbed. Among the gases listed, hydrogen has by far the lowest critical temperature,

33 K

, so it is the hardest to liquefy and is adsorbed the least.

JEE Main · 2019 · 12 Jan 2019 · Shift 1 · Single correct option

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