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 $d^5$. $CN^-$ 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 $d^6$. $NO_2^-$ is a strong field ligand,causing pairing of electrons,resulting in a low spin complex.$3$. In $[Mn(CN)_6]^{3-}$,$Mn^{3+}$ is $d^4$. $CN^-$ is a strong field ligand,causing pairing of electrons,resulting in a low spin complex.Since all the given complexes contain strong field ligands that force electron pairing,all of them are low spin complexes.

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