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Q.

In brown ring complex, the central metal is

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a

Fe(I)

b

Fe(II)

c

Fe(III)

d

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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