Question

The critical temperature of A, B, C, D gases are 190 K, 630 K, 261 K, 400 K respectively. The quantity of gas adsorbed per gram of charcoal at same pressure is least for the gas

• A. D
• B. C
• C. B
• D. A

Hint:

Remember that higher critical temperature means easier liquefaction and greater adsorption.

Answer 1

The Correct Option is D

The critical temperature of a gas is directly proportional to its ease of liquefaction. Gases with higher critical temperatures are easier to liquefy. The extent of adsorption of a gas on a solid surface is related to its ease of liquefaction. Gases that are easier to liquefy are adsorbed to a greater extent. Given the critical temperatures of the gases:
A: 190 K
B: 630 K
C: 261 K
D: 400 K
The gas with the lowest critical temperature will be the least easily liquefied and hence will be adsorbed the least.
Therefore, gas A with a critical temperature of 190 K will be adsorbed the least.