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The oxidation number of iron in brown ri...

The oxidation number of iron in brown ring complexes +x. What is value of x.

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The brown ring complex compound is given as: `[Fe(H_(2)O)_(5)NO] SO_(4)`.
The complex ion is `[Fe(H_(2)O)_(5))NO]^(2+)`
Oxidation number of `H_(2)O` is zero and NO is +1.
Oxidation state of Fe is +1.
Experimentally, the number of unpaired electrons also support +1 state of Fe (But not +2 state).
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