What is the oxidation number of Co in the complex [Co(H₂O)₄Cl₂]Cl A) +1 B) +2 C) +3 D) +4 E) None of the above

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The complex is [Co(H2O)4Cl2]Cl. In this complex, water molecules (H2O) are neutral ligands and do not contribute to the oxidation state of Co. Chloride ions (Cl-) inside the complex contribute -1 each. The overall charge of the complex ion is +1 (considering the extra Cl- outside the complex). To balance this, the oxidation state of Co must be +3.

What Is the Oxidation Number of Co in the Complex