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Question

[Fe(H2O)5NO]2+ is a complex formed during the brown ring test for NO−3 ion. In this complex :

A
There are three unpaired electrons so that its magnetic moment is 3.87 BM
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B
NO transfer its electron to Fe2+ so that iron as Fe() and NO as NO+
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C
The colour is because of charge transfer
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D
All of the above statements are correct
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Solution

The correct option is B All of the above statements are correct
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.
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