Which of the following is a low spin complex?

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(D) low spin complex is formed when the crystal field splitting energy $(\Delta_o)$ is greater than the pairing energy $(P)$,which typically occurs wi

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(D) low spin complex is formed when the crystal field splitting energy $(\Delta_o)$ is greater than the pairing energy $(P)$,which typically occurs with strong field ligands like $CN^-$ and $NO_2^-$. $1$. In $[Fe(CN)_6]^{3-}$,$Fe^{3+}$ is a $d^5$ system. $CN^-$ is a strong field ligand,causing pairing of electrons,resulting in a low spin complex. $2$. In $[Co(NO_2)_6]^{3-}$,$Co^{3+}$ is a $d^6$ system. $NO_2^-$ is a strong field ligand,causing pairing of electrons,resulting in a low spin complex. $3$. In $[Mn(CN)_6]^{3-}$,$Mn^{3+}$ is a $d^4$ system. $CN^-$ is a strong field ligand,causing pairing of electrons,resulting in a low spin complex. Therefore,all the given complexes are low spin complexes.

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