1.

The compound (A) is a white solid. When heated strongly, it leaves no residue. On treating (A) with NaOH solution, a colourless pungent smelling gas (B) is evolved which is industrially highly useful. When the compound (A) is acidified with dilute HCl, a reddish brown gas (C ) is evolved. The pungent smelling gas (B) is

Answer»

sulphur dioxide
chlorine
hydrogen chloride GAS
ammonia.

Solution :The PUNGENT smelling gas on treating ammonium nitrite with NaOH is ammonia `(NH_(3))`.
`underset((A)) (NH_(4)NO_(2))+ NaOH to NaNO_(2) + underset((B)) (NH_(3)+H_(2)O)`


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