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Q. The lowest value of paramagnetism is shown by

Coordination Compounds

Solution:

$\left[ Co ( CN )_{6}\right]^{3-} \Rightarrow Co ^{3+} \Rightarrow [ Ar ] 3 d ^{6}$ $\Rightarrow CN ^{-} \Rightarrow $ Strong field ligand.
Refer to image.
No Unpaired electrons.
image