Coordination CompoundHard
Question
The diamagnetic species is :
Options
A.[Ni(CN4)]2-
B.[NiCl4]2-
C.[NoCl4]2-
D.[NoF6]2-
Solution
In [Ni(CN4)]2-, nickel has oxidation no. of +2. So electronic configuration of its outer most orbital is as follows :

However,CN- is a strong ligand which forces the electron to pair up. Thus two unpaired electron are forced to pair up by CN-

So, it becomes diamagnetic.

However,CN- is a strong ligand which forces the electron to pair up. Thus two unpaired electron are forced to pair up by CN-

So, it becomes diamagnetic.
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