Nomenclature
The IUPAC name of [Co(NH3)5Cl]Cl2 is:
Select the correct option:
Solution
Pentaamminechloridocobalt(III)chloride
First determine oxidation state of Co in the complex ion [Co(NH3)5Cl]2+. NH3 is neutral and coordinated Cl is −1, so x − 1 = +2 gives x = +3. Ligands are named as ammine and chlorido, arranged alphabetically, followed by metal with oxidation state. Counter ion is chloride.
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About This Question
- Subject
- chemistry
- Chapter
- coordination compounds
- Topic
- nomenclature
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Pentaamminechloridocobalt(III)chloride
First determine oxidation state of Co in the complex ion [Co(NH3)5Cl]2+. NH3 is neutral and coordinated Cl is −1, so x − 1 = +2 gives x = +3. Ligands are named as ammine and chlorido, arranged alphabetically, followed by metal with oxidation state. Counter ion is chloride.
This medium difficulty chemistry question is from the chapter coordination compounds, covering the topic of nomenclature. It appeared in the 2025 exam.
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