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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.

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Correct Answer - A
The compound (A) is ammonium nitrite as is suggested from the available information. It decomposes as :
`underset((A)) (NH_(4)NO_(2)) overset("heat")to underset(("no residue")(N_(2)+2H_(2)O)`

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