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Nomenclature

Mediumchemistry

The IUPAC name of [Co(NH3)5Cl]Cl2 is:

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About This Question

Subject
chemistry
Chapter
coordination compounds
Topic
nomenclature
Difficulty
Medium
Year
2025
Tags
IUPACOxidation StateLigand Naming

Solution

Correct Answer:

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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