Of the following complex ions,which is diamag | vedclass

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(B) The electronic configuration of $Ni$ is $[Ar] 3d^8 4s^2$. In $[Ni(CN)_4]^{2-}$,$Ni$ is in the $+2$ oxidation state,so its configuration is $Ni^{2+

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$[Ni(CN)_4]^{2-}$

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(B) The electronic configuration of $Ni$ is $[Ar] 3d^8 4s^2$. In $[Ni(CN)_4]^{2-}$,$Ni$ is in the $+2$ oxidation state,so its configuration is $Ni^{2+} = 3d^8$.Since $CN^-$ is a strong field ligand,it causes pairing of electrons in the $3d$ orbitals.This results in $d^8$ configuration with all electrons paired,making the complex diamagnetic.In contrast,$[NiCl_4]^{2-}$,$[CuCl_4]^{2-}$,and $[CoF_6]^{3-}$ contain unpaired electrons and are paramagnetic.

Of the following complex ions,which is diamagnetic in nature?

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