(C) The correct answer is $(C)$.$DMG$ (Dimethylglyoxime) is a polydentate ligand that coordinates to a central metal ion (like $Ni^{2+}$) through two

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(C) The correct answer is $(C)$.$DMG$ (Dimethylglyoxime) is a polydentate ligand that coordinates to a central metal ion (like $Ni^{2+}$) through two donor atoms,forming a stable five-membered ring structure known as a chelate.$H_2O$,$OH^{-}$,and $Cl^{-}$ are monodentate ligands and cannot form chelates.