Question

The van der Waals' constant ${}^{\prime }{a}^{\prime }$ for different gases have been given as:

Gas	$a\left(atm{L}^{2}mo{l}^{-2}\right)$
$O_2$	$1.36$
$N_2$	$1.39$
$C{H}_4$	$2.25$
$N{H}_3$	$4.17$

The gas that can be most easily liquefied is:

• A. $O_2$
• B. $N_2$
• C. $C{H}_4$
• D. $N{H}_3$

Answer 1

The correct option is D $N{H}_3$

The gas that can be most easily liquefied is ammonia $N{H}_3$ as it has highest value of the van der Waals' constant ′a′.
Note: The higher is the value of van der Waals' constant ′a′, stronger are the inermolecular forces of attraction and greater is the ease of liquefaction.