IUPAC name of the complex K3[Cr(C2O4)3] is Potassium trioxalatochromate(III). Here, oxalate is a bidentate ligand thus oxidation state of Cr will be 3.
The formula of Hexaamminecobalt(III) sulphate is [Co(NH3)6]2(SO4)3. Here, ammine is a neutral ligand.
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