Statement (S): Ammonia is widely used in agriculture as fertiliser.

Explanation

The statement is true, but the reason is false. Ammonia supplies nitrogen and is used directly as a fertiliser and to manufacture other nitrogen fertilisers. Ammonia is the retained common name of NH₃; azane is its systematic parent-hydride name, while nitrogen trihydride is a compositional name. Calling ammonia the systematic name reverses this distinction. The compound’s name also does not explain its agricultural use.