Inner orbital complex which is paramagnetic in nature?
​ 1. [Ni(CN)5]–3 2. [Fe(CN6)]–4 3. [Fe(H2O)5(NO)]SO4 4. [Fe(CN)6]–3
Please explain how to solve this 

Dear student
Please find the solution to the asked query:

1. [Ni(CN)5]–3  
Ni has the configuration 3d84s2
In the complex the oxidation state of Ni becomes +2
The configuration becomes 3d8
CN is a stron field ligand, hence pairing takes place so the complex is diamagnetic.

2..[Fe(CN)6]4-
Fe has the configuration 3d64s2
The oxidation state of Fe in the complex is +2
So the configuration becomes 3d6
The complex is diamgnetic  in nature as the electrons remain paired.

3.​ [Fe(H2O)5(NO)]SO4
The Fe in the complex is in +2 state
So the configuration becomes 3d6
The complex is diamgnetic  in nature as the electrons remain paired.


4.[Fe(CN)6]3-
Fe has the configuration 3d64s2
The oxidation state of Fe in the complex is +3
So the configuration becomes 3d5
The complex is paramagnetic in nature as the electrons remain unpaired.

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