Surface Chemistry - Result Question 10
10.
$\text{Given, Gas : } \hspace{30mm} H_2, \hspace{3mm} CH_4, \hspace{3mm} CO_2, \hspace{3mm} SO_2$
$\text{Critical temperature/K } \hspace{13mm} 33 \hspace{6mm} 190 \hspace{6mm} 304 \hspace{6mm} 630$
On the basis of data given above, predict which of the following gases shows least adsorption on a definite amount of charcoal?
(2019 Main, 12 Jan I)
(a) $CH _4$
(b) $SO _2$
(c) $CO _2$
(d) $H _2$
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Answer:
Correct Answer: 10. (d)
Solution:
Same adsorbant (charcoal in this case) at same temperature will adsorb different gases to different extent. The extent to which gases are adsorbed is proportional to the critical temperature of gas.
$ \because \quad T _c=\frac{8 a}{27 R b} $
where, $a$ is the magnitude of intermolecular forces between gaseous molecules.
Thus, higher the critical temperature more is the gas adsorbed. Among the given gases, $H _2$ has the minimum critical temperature, i.e. $33 K$ thus, it shows least adsorption on a definite amount of charcoal.
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