Which of the following is diamagnetic?

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(B) To determine the magnetic nature,we analyze the electronic configuration of the central metal ion in each complex:$1$. In $[Fe(CN)_6]^{3-}$,$Fe^{3

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$[Co(C_2O_4)_3]^{3-}$

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(B) To determine the magnetic nature,we analyze the electronic configuration of the central metal ion in each complex:$1$. In $[Fe(CN)_6]^{3-}$,$Fe^{3+}$ is $d^5$. $CN^-$ is a strong field ligand,causing pairing. It has $1$ unpaired electron (paramagnetic).$2$. In $[Co(C_2O_4)_3]^{3-}$,$Co^{3+}$ is $d^6$. $C_2O_4^{2-}$ is a strong field ligand,causing pairing. It has $0$ unpaired electrons ($d^2sp^3$ hybridization),making it diamagnetic.$3$. In $[FeF_6]^{3-}$,$Fe^{3+}$ is $d^5$. $F^-$ is a weak field ligand,resulting in $5$ unpaired electrons (paramagnetic).$4$. In $[CoF_6]^{3-}$,$Co^{3+}$ is $d^6$. $F^-$ is a weak field ligand,resulting in $4$ unpaired electrons (paramagnetic).Therefore,$[Co(C_2O_4)_3]^{3-}$ is the diamagnetic complex.

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