Question:
The IUPAC name of \( [Co(NH_{3})_{5}ONO]^{2+} \) ion is
The IUPAC name of \( [Co(NH_{3})_{5}ONO]^{2+} \) ion is
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$ONO$ = nitrito (bonded via O); $NO_2$ = nitro (bonded via N).
Updated On: Apr 10, 2026
- penta ammine nitrito cobalt (IV) ion
- penta ammine nitrito cobalt (III) ion
- penta ammine nitro cobalt (III) ion
- penta ammine nitro cobalt (IV) ion
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Identify Ligands
The complex contains five ammine ($NH_3$) ligands and one nitrito ($ONO^-$) ligand.
Step 2: Determine Oxidation State
Let oxidation state of $Co$ be $x$: $x + 5(0) + (-1) = +2 \Rightarrow x = +3$.
Step 3: Naming
Name ligands alphabetically (ammine before nitrito). The nitrite ligand is bonded through Oxygen, so it is called "nitrito". The full name is: penta ammine nitrito cobalt (III) ion.
Final Answer: (b)
The complex contains five ammine ($NH_3$) ligands and one nitrito ($ONO^-$) ligand.
Step 2: Determine Oxidation State
Let oxidation state of $Co$ be $x$: $x + 5(0) + (-1) = +2 \Rightarrow x = +3$.
Step 3: Naming
Name ligands alphabetically (ammine before nitrito). The nitrite ligand is bonded through Oxygen, so it is called "nitrito". The full name is: penta ammine nitrito cobalt (III) ion.
Final Answer: (b)
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