Question

The $N{H}_3$ gas is liquified more easily than $N_2$. Hence :

• A. Vanderwaal's constant a and b of $N{H}_3$ = that of $N_2$
• B. a and b of $N{H}_3$ < that of $N_2$
• C. a ($N{H}_3$) > a ($N_2$) but b ($N{H}_3$) < b ($N_2$)
• D. the intermolecular force of attraction between the $N{H}_3$ molecules > that between the $N_2$ molecules

Answer 1

Answer: (C), (D)

the intermolecular force of attraction between the $N{H}_3$ molecules > that between the $N_2$ molecules

The value of a is a measure of the ability of the gas to get liquified easily.

So, a for $N{H}_3$ > a for $N_2$

and b for $N{H}_3$ < b for $N_2$

Also, the intermolecular force of attraction between $N{H}_3$ molecules > the force between $N_2$ molecules. It is due to hydrogen bonding in ammonia. Hence option (c) and (d) are correct.