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  4. The complex showing a spin only magnetic moment of 2.82 BM is

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Q. The complex showing a spin only magnetic moment of $2.82\, BM$ is

IIT JEEIIT JEE 2010Coordination Compounds

Solution:

Magnetic moment $=2.83 \,BM $
indicates that there is two unpaired electrons.
$ \mu = \sqrt {n(n+2)} BM= \sqrt 8\, BM=2.82\, BM $
In $[NiCI_4]^{2-},Ni \,$ has $ d^8 $ configuration
and $Cl^- $ is a weak ligand:

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