What is the coordination number and oxidation state of cobalt in the complex [Co(NH3)5Cl]Cl2?
Answer and explanation
Correct answer: D. Coordination number 6; oxidation state +3 pathway
Cobalt is coordinated to five neutral NH3 ligands and one coordinated Cl- ligand, giving a coordination number of 6. With two outer Cl- counter-ions and one inner Cl- ligand, the complex cation has a +2 charge, meaning Co is in the +3 oxidation state.
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