The most stable ion is

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(D) The stability of coordination complexes depends on the nature of the ligand. $CN^-$ is a strong field ligand and a strong Lewis base,which forms a

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

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(D) The stability of coordination complexes depends on the nature of the ligand. $CN^-$ is a strong field ligand and a strong Lewis base,which forms a very stable complex with the $Fe^{3+}$ ion due to strong back-bonding and high crystal field splitting energy. Among the given options,$[Fe(CN)_6]^{3-}$ is the most stable complex due to the strong field nature of the cyanide ligand. Therefore,the correct option is $D$.

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