The IUPAC name for the complex \( [\text{Co}(\text{ONO})(\text{NH}_3)_5]\text{Cl}_2 \) is
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When naming coordination compounds, make sure to specify the donor atom (either \( O \) or \( N \)) for ambidentate ligands like \( \text{ONO} \) to avoid confusion.
The complex \( [\text{Co}(\text{ONO})(\text{NH}_3)_5]\text{Cl}_2 \) consists of:
\( \text{ONO} \): A nitrito ligand coordinated via the oxygen atom (denoted as "nitrito-O"),
\( \text{NH}_3 \): Neutral ammine ligands,
\( \text{Cl}_2 \): Counter ions.
To determine the oxidation state of cobalt, use the following calculation:
\[
\text{Co} + 5(0) + (-1) + 2(-1) = 0 \implies \text{Co} = +3.
\]
Therefore, the IUPAC name of the complex is:
\[
\boxed{\text{Pentaammine-nitrito-O-cobalt(III) chloride}}.
\]