The oxidation number of Co in [Co(NH₃)₄Cl₂]Cl is +1.

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The oxidation number of Co in [Co(NH₃)₄Cl₂]Cl is not +1. To determine the oxidation number of Co, we need to assign oxidation numbers to the other atoms in the complex. Since Cl is more electronegative than Co, we assign it an oxidation number of -1. The NH₃ and ₄ ligands are neutral, so their sulfur atoms have oxidation numbers of 0. The ₂ ligand is negatively charged, so its sulfur has an oxidation number of -2. Therefore, in order for the compound to have a net charge of 0, the oxidation number of Co must be +3.

The Oxidation Number of Co in [Co(NH3)4Cl2]Cl Is +1

The Oxidation Number of Co in [Co(NH₃)₄Cl₂]Cl Is +1