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.