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 compound (A) is :
A. ammonium nitrite
B. ammonium chloride
C. sodium nitrite
D. sodium nitrate.