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(B) The crystal field splitting energy,$\Delta_0$,depends on the nature of the ligand and the oxidation state of the metal ion.Ligands are arranged in

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$[Co(NH_3)_6]^{3+}$

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(B) The crystal field splitting energy,$\Delta_0$,depends on the nature of the ligand and the oxidation state of the metal ion.Ligands are arranged in the spectrochemical series based on their field strength: $I^{\ominus} In the given complexes,the metal ion is $Co^{3+}$ in all cases.Comparing the ligands: $F^{\ominus}$ (weak field),$C_2O_4^{2-}$ (moderate field),$H_2O$ (moderate field),and $NH_3$ (strong field).Since $NH_3$ is the strongest ligand among the options provided,the complex $[Co(NH_3)_6]^{3+}$ will have the highest magnitude of $\Delta_0$.Therefore,the correct option is $B$.

Which one of the following complexes has the highest magnitude of crystal field splitting energy $\left(\Delta_0\right)$?

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