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(A) The extent of adsorption of a gas on a solid adsorbent like charcoal depends on the ease of liquefaction of the gas.Easily liquefiable gases have

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$He$

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(A) The extent of adsorption of a gas on a solid adsorbent like charcoal depends on the ease of liquefaction of the gas.Easily liquefiable gases have higher critical temperatures $(T_c)$ and are adsorbed to a greater extent.Conversely,gases with lower critical temperatures are difficult to liquefy and show the least adsorption.Comparing the given values: $T_c(He) = 5.2 \ K$,$T_c(CH_4) = 190 \ K$,$T_c(CO_2) = 304.2 \ K$,and $T_c(NH_3) = 405.5 \ K$.Since $He$ has the lowest critical temperature $(5.2 \ K)$,it shows the least adsorption on charcoal.

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

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:

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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: