oxidation state of cobalt in [Co(NH3)6]2(SO4)3

Dear Student,

First, we need to find oxidation state of cobalt(Co). Let us assume it to be +x. Now, NH3 is a neutral ligand. The overall charge on the cationic complex is +3. Hence,
   x+(6*0)=+3 ⇒ x = +3

Regards.

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