Question

The value of ${}^{\prime }{a}^{\prime }$ in Van der Waal's equation for the gases $O_2,N_2,N{H}_3$ and $C{H}_4$ are $1.35,1.38,4.16$ and $2.25$ respectively. The gas which can most easily be liquified is

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

Answer 1

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

Attraction coefficient $\left(a\right)\propto$ attractive force.
And we know that, gases having more attractive intermolecular force, can be liquified easily.
$\therefore N{H}_3$ will liquify easily as it has highest ${}^{\prime }{a}^{\prime }$ value among the given gases.