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Abhijeet Gaurav Best Answer
Coordination number of nickel in [Ni(C2O4)3]4− is 6 because (C2O4)2- is a bidentate ligand. (C2O4)2- is a bindendate ligand. It means that it can bind with Metal 2 valency & as here there are 3 (C2O4) so they can bind to 6 valency of Ni metal. Thus it's coordination number is 6.