All statements are true except (III), that both are outer orbital complexes In fact. In both the given complexes, the central metal is in the same oxidation state. i.e +3 [CoF6]3− due to weak ligand (F) does not go for pairing and show outeroctahedral orbital complex (sp3d2) As it has five unpaired electrons, therefore, it is paramagnetic in nature While [Co(C2O4)3|3− due to strong bidentate ligand. go for pairing and forms inner octahedral orbital complex(d2sp3) As it does not have unpaired electrons. therefore it is diamagnetic in nature.