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Question

Give the oxidation number and coordination number of the central metal atom in the complex compound K3[Fe(C2O4)3].

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Solution

The central atom in the complex K3[Fe(C2O4)3] is Fe. Its coordination number is 6. It is attached to three oxalate ligands Oxalate is a bidentate ligand.
The oxidation number of Fe is +3. Each oxalate ligand has oxidation number of 2 and each potassium ion has oxidation number of +1. Let X be the oxidation number of Fe.
3(+1)+X+3(2)=0
X=+3

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