1.

When dilute ferrous (Fe^(2+)) salt solution is added to an aqeous solution containing nitrate (NO_(3)^(-)) ion followed by the addition of conc. H_(2)SO_(4) forms a brown colored ring. What is te chemical composition of the complex that is responsible for this brown colored ring.

Answer»

`Fe(NO_(3))_(2)`
`[Fe(H_(2)O)_(5)(NO)]^(2+)`
`[Fe(H_(2)O)_(5)(NO_(3))]^(+)`
`[Fe(H_(2)O)_(4)(NO)(NO_(3))]^(+)`

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