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Ethylenediamine and oxalate are both ligands that can form coordination complexes with metal ions. Ethylenediamine is a stronger ligand than oxalate because it forms more stable complexes. This is due to the chelate effect, where the formation of a ring-like structure with the metal ion increases the stability of the complex. Ethylenediamine forms a five-membered ring, while oxalate forms a four-membered ring, making ethylenediamine a stronger ligand.