Colourless salt (A) on heating with NaOH gives gas (B). When reaction of (A) with NaOH was complete, solution obtained on reacting `FeSO_(4)` and conc. `H_(2)SO_(4)` gave a brown coloured ring (C ) between two layers. (A) on heating strongly forms (D ) and (E). Compound (E ) is neutral oxide of a dibasic acid (F).
What is compound (A)

Options

A. `NH_(4)NO_(3)`
B. `NaNO_(3)`
C. `KNO_(3)`
D. None of these

Answer

A

Explanation

`underset((A))(NH_(4)NO_(3))+NaOHoverset(Delta)(rarr)underset((B))(NH_(3))+NaNO_(3)+H_(2)O`
`NO_(3)^(-)+FeSO_(4)+H_(2)SO_(4)rarrunderset("Brown ring ")([Fe(H_(2)O)_(5)NO]SO_(4))`
`underset((F))(HO)-overset(ddot)(N)=overset(ddot)(N)-OHoverset(Delta)(rarr)N_(2)O+underset((E))(H_(2)O)`
`underset((A))(NH_(4)NO_(3))" "underset((D))(N_(2)O)+underset((E))(2H_(2)O)`