Cobalt has the highest oxidation state in which compound?

1.) K4[CoF6]
2.) Co2(CO)8
3.) [Co(NH3)6]Cl2
4.) Na2[CoCl4]
5.) [Co(NH3)4 Cl2]Cl

Thanks!

Answer:
(1) oxidation state is +2
(2) 0
(3) +2
(4) +2
(5) +3

(5)

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