Question

Compressibility factor $\left(Z = \frac{P V}{n R T}\right)$ is plotted against pressure



What is the correct order of liquefiability of the gases shown in the above graph?

• A. $H_{2} < N_{2} < CH_{4} < CO_{2}$
• B. $CO_{2} < CH_{4} < N_{2} < H_{2}$
• C. $H_{2} < CH_{4} < N_{2} < CO_{2}$
• D. $CH_{4} < H_{2} < N_{2} < CO_{2}$

Answer 1

Answer: (A)

Lesser is the value of Z at a pressure, easy will be the liquefaction of the gas. Z < 1 shows the dominance of attractive forces.

The order of liquefication as follows

$H_{2} < N_{2} < CH_{4} < CO_{2}$