Given below are the critical temperatures of some of the gases : | Gas | Critical temperature (K) | |-----|-------------------------| | He | 5.2 | | $\mathrm{CH}_{4}$ | 190 | | $\mathrm{CO}_{2}$ | 304.2 | | $\mathrm{NH}_{3}$ | 405.5 | The gas showing least adsorption on a definite amount of charcoal is :

JEE Main · 2022 · 29 Jul 2022 · Shift 2 · Surface Chemistry

Given below are the critical temperatures of some of the gases :

Gas	Critical temperature (K)
He	5.2
$CH_{4}$	190
$CO_{2}$	304.2
$NH_{3}$	405.5

The gas showing least adsorption on a definite amount of charcoal is :

(A)He✓ Correct
(B) $CH_{4}$
(C) $CO_{2}$
(D) $NH_{3}$

Answer: (A)

Solution

Adsorption on charcoal increases with the ease of liquefaction of the gas. Gases with higher critical temperatures are easier to liquefy and show greater adsorption.

Among the given gases, He has the lowest critical temperature (5.2 K), making it the hardest to liquefy and thus showing the least adsorption.

Answer: (A) He

JEE Main · 2022 · 29 Jul 2022 · Shift 2 · Single correct option

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