Q.

Number of unpaired electrons in [Fe(CN)6]4- ion
 

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a

 zero

b

6

c

4

d

5

answer is D.

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Detailed Solution

[Fe(CN)6]4– has zero unpaired electrons.

[Fef6]4- contains 4 unpaired electrons.

F-  = weak field ligand

For an atom that is going to be in a complex ion to have the most stable configuration, it will have its highest number of unpaired electrons. 

In the case of [Fe(CN)6]s and any other metal ion complex, this would be 6.  

The complex ion is called a hexacoordinate complex ion or hexacoordinated complex ion.

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