Question

Whenever a mixture of gases is allowed to come in contact with a particular adsorbent under the same conditions, the more strong adsorbate is adsorbed to greater extent irrespective of its amount present. For example, $H_{2}O$ is adsorbed to more extent on silica gel than $N_2$ and $O_2$. This shows that some adsorbates are preferentially adsorbed. It is also observed that preferentially adsorbable adsorbents can displace a weakly adsorbed substance from the surface of an adsorbent.

Which of the gas can displace remaining all the gases?

• A. $O_2$
• B. $N_2$
• C. $CO$
• D. $H_2$

Answer 1

Answer: (C)

$CO$

Whenever a mixture of gases is allowed to come in contact with a particular adsorbent under the same conditions, the more strong adsorbate(Depends on factors like polarity and chemical reactivity) is adsorbed to greater extent irrespective of its amount present, e.g.$H_{2}O$ is adsorbed to more extent on silica gel than $N_2$ and $O_2$
Here, among given gases, CO is most reactive and most polar so it will replace all other gases.