[Fe(H_2O)_5NO]^ 2+ is the brown-ring complex formed in the test for NO_3^-. In this complex, NO transfers its electron to Fe^ 2+ so that

JEE Advanced Chemistry question

is the brown-ring complex formed in the test for . In this complex, NO transfers its electron to so that

(A)There are three unpaired electrons, making iron effectively Fe(I) and nitrosyl
(B)The magnetic moment of Fe is 3.87 BM
(C)The colour is due to charge transfer
(D)All of the above are correctCorrect

Answer: (D)

Solution

In the brown-ring complex, NO is formally oxidized to while Fe is reduced to the unusual +1 oxidation state (a configuration with 3 unpaired electrons, giving the spin-only moment

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Question ID VK-159822