1.

A brown ring is formed in the ring test for NO_3^(-) ion. It is due to the formation of

Answer»

`[FE(H_2O)_5(NO)]^(2+)`
`FeSO_(4).NO_(2)`
`[Fe(H_2O)_4(NO)_2]^(2+)`
`FeSO_(4).HNO_(3)`

ANSWER :A


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