Question:
The IUPAC name of the complex \([Co(NH_3)_3(H_2O)_3]Cl_3\) is
The IUPAC name of the complex \([Co(NH_3)_3(H_2O)_3]Cl_3\) is
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Always arrange ligands alphabetically, ignoring prefixes like di-, tri-.
Updated On: Apr 24, 2026
- triaquatrianminecobalt(III) chloride
- triammine triaquacobalt(III) chloride
- triaquatrianminecobalt(II) chloride
- triammine triaquacobalt(II) chloride
- triaquatriamminecobalt(III) trichloride
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The Correct Option is B
Solution and Explanation
Concept:
Rules for naming coordination compounds:
• Ligands named alphabetically
• Neutral ligands: ammine (\(NH_3\)), aqua (\(H_2O\))
• Oxidation state written in Roman numerals
Step 1: Identify ligands.
\[ NH_3 \rightarrow \text{ammine}, \quad H_2O \rightarrow \text{aqua} \]
Step 2: Arrange alphabetically.
ammine comes before aqua: \[ \text{triammine triaqua} \]
Step 3: Find oxidation state of Co.
\[ x + 0 + 0 = +3 \Rightarrow Co^{3+} \]
Step 4: Write final name.
\[ \text{triammine triaquacobalt(III) chloride} \]
• Ligands named alphabetically
• Neutral ligands: ammine (\(NH_3\)), aqua (\(H_2O\))
• Oxidation state written in Roman numerals
Step 1: Identify ligands.
\[ NH_3 \rightarrow \text{ammine}, \quad H_2O \rightarrow \text{aqua} \]
Step 2: Arrange alphabetically.
ammine comes before aqua: \[ \text{triammine triaqua} \]
Step 3: Find oxidation state of Co.
\[ x + 0 + 0 = +3 \Rightarrow Co^{3+} \]
Step 4: Write final name.
\[ \text{triammine triaquacobalt(III) chloride} \]
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