Question

$N{H}_3$ gas is liquefied more easily than $N_2$, hence:

• A. vander Waal's constants 'a' and 'b' of $N{H}_3>N_2$
• B. vander Waal's constants 'a' and 'b' of $N{H}_3<N_2$
• C. Both A and B
• D. None of these

Answer 1

Answer: (C)

Both A and B

'a' represents attraction between molecules.
'b' represents size\volume of the molecule.
For $N{H}_3$ gas to be more liquifiedable than $N_2$, one of the following must hold.
i) $a_{N{H}_3}>a_{N_2}$
ii) $b_{N{H}_3}<b_{N_2}$
iii) Both (i) and (ii) should hold simultaneously.