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Among the following, van der Waals' constant $a$ would be maximum for
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The correct answer is:
$\mathrm{NH}_3$
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.
$$
a \propto \text { attraction }
$$
There is maximum attraction in $\mathrm{NH}_3$ because there is $\mathrm{H}$-bond and in all other compounds, have van der Waals' force.
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