Among the following, van der Waals' constant $a$ would be maximum for
Among the following, van der Waals' constant $a$ would be maximum for
$\mathrm{H}_2$
$\mathrm{O}_2$
$\mathrm{CH}_4$
$\mathrm{NH}_3$
Solution
van der Waals' constant (a) depend upon attraction i.e.
$
a \propto \text { attraction }
$
There is maximum attraction in $\mathrm{NH}_3$ because there is $\mathrm{H}$-bond and in all other compounds, have van der Waals' force