Coordination CompoundHard
Question
The complex [ Fe (H2O)5 NO ]2+ is formed in the ′brown ring test′ for nitrates. Choose the incorrect statement for the complex.
Options
A.Its magnetic moment is approximately 3.9 B.M.
B.The oxidation state of iron is + 1
C.The hybridisation of central metal ion is sp3 d2
D.The brown colour of the ring is due to d - d transition.
Solution
The iron is in +1 oxidation state with 3d7 electron configuration and NO is NO+.
[Fe (H2O)5 NO ]2+
So, μ =
or μ = 
= 3.9
The colour is due to charge transfer not because of d-d transition of electron.
[Fe (H2O)5 NO ]2+
So, μ =
or μ = = 3.9The colour is due to charge transfer not because of d-d transition of electron.
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