Question

The value of van der Waals gas constant, a is
highest for

(1) NH3
(2) 02
(3) N₂
(4) He
​

Answer 1

Answer:

Van der Waal's constant 'a' is an indirect measure of inter-molecular attractive forces. Ammonia contains strong inter-molecular forces of attraction. Inter-molecular hydrogen bonding is absent in other gases.

Hence, the value of van der Waal's constant 'a' is larger for ammonia than for other gases.

Hence, ammonia can be most easily liquefied.

Answer 2

Answer:

1) NH3

Explanation:

'a' is the measure of intermolecular forces. Intermolecular force of NH3 is maximum, hence van der Waals' constant (a) will also be maximum as NH3 is a polar molecule.