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  4. The Co-ordination number of Fe and Co in the complex ions, Fe(C2O4)3]3- and [Co(SCN)4]2- are respectively:

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Q. The Co-ordination number of $Fe$ and $Co$ in the complex ions, $Fe(C_2O_4)_3]^{3-}$ and $[Co(SCN)_4]^{2-}$ are respectively:

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Solution:

$C _{2} O _{4}^{2-}$ is the oxalate ligand. It binds through two oxygen atoms and thus, is a bidentate ligand.

Hence the co-ordination number of $Fe$ in $\left[ Fe \left( C _{2} O _{4}\right)_{3}\right]^{3-}$ is $6$ .

$SCN^-$ is the thiocyanate ligand. It is a monodentate ligand. Hence the co-ordination number of

$Co$ in the complex ion $\left[ Co ( SCN )_{4}\right]^{2-}$ is $4$ .