Question

The highest volume of which of the following gases would be adsorbed by 1 g of charcoal at 298 K?

• A. H$_2$
• B. CH$_4$
• C. CO$_2$
• D. NH$_3$

Hint:

Greater polarity and ease of liquefaction of gas \(\Rightarrow\) greater adsorption on charcoal.

Answer 1

The Correct Option is D

Step 1: Recall principle of adsorption.
Extent of adsorption depends on the nature of the gas. More easily liquefiable gases are adsorbed more strongly.
Step 2: Compare given gases.
- H$_2$: Least adsorbed, as it is highly non-polar and light.
- CH$_4$: More adsorbed than H$_2$, but weak van der Waals forces.
- CO$_2$: More adsorbed due to higher polarity.
- NH$_3$: Maximum adsorption, as it is highly polar and strongly interacting.
Step 3: Conclusion.
Thus, NH$_3$ is adsorbed in the largest amount by charcoal.