Question

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 the compound (C)
A. `[Fe(H_(2)O)_(4).NO]SO_(4)`
B. `[Fe(H_(2)O)_(5)NO]SO_(4)`
C. `[Fe(H_(2)O)_(4)]SO_(4)`
D. None of these

Answer 1

Correct Answer - B
`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)`