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A brown ring is formed in the ring test ...

A brown ring is formed in the ring test for `NO_(3)^(-)` ion. It is due to the formatin of

A

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

B

`FeSO_(4).NO_(2)`

C

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

D

`FeSO_(4)HNO_(3)`

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A
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