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

Gas Critical temperature $\left(K\right)$

$He$ $5 . 2$

${CH}_{4}$ $190$

${CO}_{2}$ $304 . 2$

${NH}_{3}$ $405 . 5$

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

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

Gas	Critical temperature $\left(K\right)$
$He$	$5 . 2$
${CH}_{4}$	$190$
${CO}_{2}$	$304 . 2$
${NH}_{3}$	$405 . 5$

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

Quantrex Academy · Accepted Answer

Correct answer: A. He

The amount of gas adsorbed by a solid depends on the nature of gas. In general, easily liquefiable gases (i.e., with higher critical temperatures) are readily adsorbed as van der Waals’ forces are stronger near the critical temperatures. Thus, 1g of activated charcoal adsorbs more sulphur dioxide (critical temperature 630K), than methane (critical temperature 190K) which is still more than 4.5 mL of dihydrogen (critical temperature 33K).
So, more the critical temperature of gas greater is the ease of liquefaction hence greater is the adsorption.
Hence, among the given gases ammonia is adsorbed most and helium the least on definite amount of charcoal.

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

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