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Question

The complex [Fe(H2O)5NO]2+ is formed in the brown ring test for nitrates when freshly prepared FeSO4 solution is added to aqueous solution of NO3 followed by addition of concentrated H2SO4. Select correct statements about this complex:

A
Color change is due to charge transfer
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B
It has iron in +1 oxidation state and nitrosyl as NO+
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C
It has magnetic moment of 3.87 B.M. confirming three unpaired electrons in Fe
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D
In complex Fe has d2sp3 hybridization
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Solution

The correct option is C It has magnetic moment of 3.87 B.M. confirming three unpaired electrons in Fe
(a) Fe2+ changes to brown colored ring complex and the color change is due to charge transfer
(b) NONO++e Fe2++eFe+

Magnetic moment =n(n+2)=15=3.87 BM
(d) It is a high sin complex, it contains 3 unpaired electrons hence, hybridisation of the complex is sp3d2.

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