Question
Select the correct $\ce{IUPAC}$ name for $\ce{[Co(NH_3​)_{6​}]^{2+}}.$

Answer

In $\ce{[CO(NH_{3​})_6​]^{2+}}$ the oxidation state of $\ce{CO}$ is $2.$
So the correct $\text{IUPAC}$ name is hexaamminecobalt$\ce{(II)}$ ion.

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