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(C) For a metal ion with a $d^6$ configuration in an octahedral complex:$1$. With a strong field ligand (e.g.,$CN^-$),the electrons pair up in the $t_

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$d^6$

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(C) For a metal ion with a $d^6$ configuration in an octahedral complex:$1$. With a strong field ligand (e.g.,$CN^-$),the electrons pair up in the $t_{2g}$ orbitals,resulting in a low-spin complex $(t_{2g}^6 e_g^0)$ which is diamagnetic.$2$. With a weak field ligand (e.g.,$F^-$),the electrons occupy all orbitals according to Hund's rule $(t_{2g}^4 e_g^2)$,resulting in a high-spin complex which is paramagnetic.Therefore,the $d^6$ configuration allows for both possibilities depending on the ligand strength.

In which of the following configurations will there be the possibility of both paramagnetism and diamagnetism,depending on the nature of the ligands?

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