Iupac Nomenclature

Oxidation State Determination: Let $x$ be the oxidation state of $C r$ . Ammonia ( $N H_{3}$ ) is neutral ( $0$ ), and Chlorine ( $Cl$ ) is $- 1$ .
- $x + 4 (0) + 2 (- 1) = + 1$ (due to the external $C l^{-}$ ion).
- $x - 2 = + 1 ⟹ x = + 3$ . The metal is Chromium(III).
Naming Ligands:
- $4$ Ammonia molecules $\to$ tetraammine (alphabetically first).
- $2$ Chlorine molecules within the sphere $\to$ dichloro.
Metal Name: Since the complex cation is positive, we use the standard name chromium.
Counter Ion: The external $C l^{-}$ is named chloride.
Final Name: Tetraamminedichlorochromium(III) chloride.

This easy difficulty chemistry question is from the chapter coordination compounds, covering the topic of iupac nomenclature. It appeared in the 2025 exam.

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