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IUPAC name of $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3\left(\mathrm{H}_2 \mathrm{O}\right)_2 \mathrm{Cl}\right] \mathrm{Cl}_2$ is
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Triamminediaquachloro cobalt (III) chloride
The complex $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3\left(\mathrm{H}_2 \mathrm{O}\right)_2 \mathrm{Cl}\right] \mathrm{Cl}_2$ contains cobalt in the +3 oxidation state. The ligands are three ammonia $\left(\mathrm{NH}_3\right)$, two water $\left(\mathrm{H}_2 \mathrm{O}\right)$, and one chloride ($\mathrm{Cl}$). According to IUPAC rules, the ligands are named alphabetically and the oxidation state of cobalt is indicated. Therefore, the correct name is Triamminediaquachloro cobalt (III) chloride.
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