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What is the oxidation number of iron in ...

What is the oxidation number of iron in the brown ring complex compound? 

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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 numbers 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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