Amongst the following, the most stable complex is
We know that the stability of a complex increases by chelation. Therefore, the most stable complex is [Fe(C2O4)3]3−.
In each of the given complex, Fe is in + 3 oxidation state. As C2042-is didentate chelating ligand, it forms chelate rings and hence (iii) out of complexes given above is the most stable complex.
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