In which of the following coordination entiti | vedclass

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(A) In all the given complexes,the central metal ion is $Co^{3+}$ ($d^6$ configuration). Since the metal ion and its oxidation state are identical,the

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$[Co(CN)_6]^{3-}$

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(A) In all the given complexes,the central metal ion is $Co^{3+}$ ($d^6$ configuration). Since the metal ion and its oxidation state are identical,the magnitude of the crystal field splitting energy $(\Delta_o)$ depends solely on the nature of the ligands. According to the spectrochemical series,the strength of ligands follows the order: $CN^- > NH_3 > H_2O > C_2O_4^{2-}$. $CN^-$ is the strongest field ligand among the given options,which causes the largest splitting of $d$-orbitals. Therefore,the magnitude of $\Delta_o$ is maximum in $[Co(CN)_6]^{3-}$.

In which of the following coordination entities the magnitude of $\Delta_o$ ($CFSE$ in octahedral field) will be maximum? (Atomic Number of $Co = 27$)

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