The oxidation number of iron in the compound formed during brown ring test for $\mathrm{NO}_{3}^{-}$ ion is ________.
$\left[\mathrm{Fe}\left(\mathrm{H}{2} \mathrm{O}\right){5}(\mathrm{NO})\right]^{2+}$,
Oxidation no. of $\mathrm{Fe}=+1$
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