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Question:

[Fe(H₂O)₅NO]²⁺ is a complex formed during the brown ring test for NO⁻ ion. In this complex: The colour is because of charge transfer; All of the above statements are correct; There are three unpaired electrons so that its magnetic moment is 3.87 BM; NO transfer its electron to Fe²⁺ so that iron as Fe⁻ and NO as NO⁺

All of the above statements are correct

The colour is because of charge transfer

There are three unpaired electrons so that its magnetic moment is 3.87 BM

NO transfer its electron to Fe²⁺ so that iron as Fe⁻ and NO as NO⁺

Solution:

In brown ring complex, iron exists in +1 due to transfer of one electron from NO and in +1 oxidation state iron has 3 unpaired electrons. The color of the complex is due to the charge transfer.