Question

An element x of group 15 exists as diatomic molecules and combine with hydrogen at 773k in the presence of catalyst to form a compound, ammonia, which has characteristic pungent smell

Answer 1

It is nitrogen (N2).

Answer 2

Answer: The element X is nitrogen and it exists as $N_2$

Explanation:

We are given an element X from group 15 which combines with hydrogen to form a compound named as ammonia. The compound formed has a pungent smell. The reaction of element X with hydrogen follows the equation:

$N_2+3H_2\overset{773K}\rightarrow 2NH-3$

Nitrogen is the element which belongs to group 15 of the periodic table and exists as a diatomic molecule.

Hence, the element X is nitrogen.