the oxidation state of cobalt in

Is the complex [CoF_6] cationic or anionic if the oxidation state of cobalt ion is +3?

In dodecacarbonyl dicobalt, the oxidation state of cobalt is:

What is the oxidation state of cobalt Co in [CoBr(NH_3)_5]SO_4

Match the compounds given in Column I with the oxidation state of cobalt present in it (given in Column II) and assign the correct code.

Match the complex given in Column-I with the oxidation state of cobalt present in it (given in Column_II)

In the complex [CoCl_(2)(en)_(2)]Br , the co-ordination number and oxidation state of cobalt are :

Oxidation state of cobalt in [Co(NH_(3))_(4)(H_(2)O)Cl]SO_(4) is