Question

Consider the graph between compressibility factor $\text{Z}$ and pressure $\text{P}$ :



The correct increasing order of ease of liquefaction of the gases shown in the above graph is

• A. ${\text{H}}_{\text{2}}\text{ < }{\text{N}}_{\text{2}}\text{ < }{\text{CH}}_{\text{4}}\text{ < }{\text{CO}}_{\text{2}}$
• B. ${\text{CO}}_{\text{2}}\text{ < }{\text{CH}}_{\text{4}}\text{ < }{\text{N}}_{\text{2}}\text{ < }{\text{H}}_{\text{2}}$
• C. ${\text{H}}_{\text{2}}\text{ < }{\text{CH}}_{\text{4}}\text{ < }{\text{N}}_{\text{2}}\text{ < }{\text{CO}}_{\text{2}}$
• D. ${\text{CH}}_{\text{4}}\text{ < }{\text{H}}_{\text{2}}\text{ < }{\text{N}}_{\text{2}}\text{ < }{\text{CO}}_{\text{2}}$

Answer 1

Answer: (A)

$Z<1$ means, force of attraction dominating i.e., a is considerable, b can be negligible at low temperature and low pressure and liquification is more.