Out of `NH_(3)` and `N_(2)`, which will have
(`a`) larger value of `a`
(`b`) larger value of `b`

Explanation

(i) `NH_(3)` will have larger value of 'a' because the attractive force in `NH_(2)` molecules are highre due to their polar nature and presence of intermolecular hydrogen bonding in the molecules.
(ii) `N_(2)` will have higher value of 'b' because of greater molecular size as compared to the size of `NH_(3)` molecules.