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B
Hexaamminecobaltate(II) ion
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C
Hexammoniacobalt(II) ion
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D
Hexaamminecobalt(II) ion
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Solution
The correct option is C Hexaamminecobalt(II) ion In [CO(NH3)6]2+ the oxidation state of CO is 2. So the correct IUPAC name is hexaamminecobalt(II) ion.