Question

The values of critical temperatures of few gases are given gases:

$\begin{array}{ccccc}Gases:& H_2& He& O_2& N_2\\ T_C\left(K\right)& 33.2& 5.2& 154.3& 126\end{array}$

From the above data arrange the given gases in the increasing order of ease of their qualification:

• A. $O_2,N_2,H_2,He$
• B. $He,N_2,O_2,H_2$
• C. $He,H_2,N_2,O_2$
• D. $H_2,N_2,O_2,He$

Answer 1

The correct option is C $He,H_2,N_2,O_2$

The increasing order of ease of their liquification is $He,H_2,N_2,O_2$. Higher is the critical temperature, higher will be the ease of liquification.
The critical temperature is the temperature below which the gas can be liquefied by the application of pressure alone.