Question

The values of van der Waal's constant "a" for the gases $O_2,N_2,N{H}_3$ and $C{H}_4$ are $1.36,1.39,4.17,2.253$ $L^2$ $atmmole$${}^{-2}$ respectively. The gas which can most easily be liquefied is :

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

Answer 1

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

van der waal's constant 'a' is a measure for the attraction between the particles. Higher the value of 'a' stronger the force between gas particles and easy to compress them in liquid. Thus, $N{H}_3$ among the gases can easily liquified.