1.

FeSO_(4)solution gives brown colour ring in testing nitrates or nitrites. This is due to formation of

Answer»

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

Solution :brown ring is formed due to `[Fe(H_(2)O)_(5)NO]^(2+)`


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