Oxidation number for achieve question #1

[605941366]

Hi,
Why is the oxidation state for [Co(NH3)4Cl2]Cl 3?
I found that chlorine would have a -1 charge and because there are two of them it would be -2 and then I believe that ammine (NH3) is neutral so where does the additional -1 come from? Is it from the Cl outside the brackets?

[Alan Limones 1H]

Yes, the additional -1 charge comes from the Chlorine outside of the coordinate compound brackets. So the oxidation number for Cobalt is 3+