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In brown ring complex, the central metal is

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Fe(I)

Fe(II)

Fe(III)

Fe(IV)

answer is A.

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Detailed Solution

Brown ring is formed during the identification of nitrates when NO reacts with a solution of FeSO₄.
It appears that the oxidation state of Fe is +2, but the transfer of the odd electron from NO to Fe(II) makes them NO⁺ and Fe(I).

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