What is the oxidation number of cobalt in [CoCl(NH₃)₅]Cl₂? A) +4 B) +1 C) +6 D) +2 E) +3

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Quizplus · Accepted Answer

The complex ion [CoCl(NH3)5]2+ has cobalt in a +3 oxidation state. This is determined by balancing the charges within the complex. Ammonia (NH3) is a neutral ligand and does not contribute to the charge, while chloride (Cl) inside the complex contributes -1. To balance the 2+ charge of the complex, cobalt must have a +3 oxidation state. The additional chloride ion outside the complex does not affect the oxidation state of cobalt within the complex.

What Is the Oxidation Number of Cobalt in [CoCl(NH3)5]Cl2

What Is the Oxidation Number of Cobalt in [CoCl(NH₃)₅]Cl₂