Sodium nitroprusside is $\mathrm{Na}{}_2[\mathrm{Fe}(\mathrm{CN}){}_5(\mathrm{NO})]$. Treat each cyanide as $\mathrm{CN}{}^{-}$ and the nitrosyl ligand as the nitrosonium cation $\mathrm{NO}{}^{+}$. What is the oxidation number of iron?

More questions on Oxidation number determination including fractional and unusual cases

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