Brown colour of the complex \( \left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5}(\math...

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Brown colour of the complex \( \left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5}(\mathrm{NO})\right] \mathrm{SO}_{4} \) is due to C.T. spectrum which causes momentary change in oxidation state. Find out oxidation state of Fe in this complex.
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