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Nitrate is confirmed by ring test. The brown colour of the ring test is due to the formation of

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Nitrate is confirmed by ring test. The brown colour of the ring test is due to the formation of
A. Ferrous nitrite
B. `FeSO_(4).NO`
C. `FeSO_(4).NO_(2)`
D. Ferrous nitrate
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`NaNO_(3)+H_(2)SO_(4)toNaHSO_(4)+HNO_(3)`
`6FeSO_(4)+3H_(2)SO_(4)+2HNO_(3)`
`to3Fe_(2)(SO_(4))_(3)+4H_(2)O +2NO`
`FeSO_(4)+NO to underset("(Brown ring)")underset("Nitrosoferrous sulphate")(FeSO_(4).NO)`
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