1.

The brown ring test for nitrites and nitrates is due to the formation of complex of iron with the formula.

Answer»

`[Fe(H_(2)O]_(5) NO]^(2+)`
`[Fe(H_(2)O]^(2+)`
`[Fe(H_(2)O) (NO)_(5)]^(2-)`
`[Fe(NO) (CN)_(5)]^(2+)`

ANSWER :A


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