Question

Vitamin B12 is a complex of
1 Co2+
2 Fe3+
3 Co3+
4 Fe2+​

Answer 1

Answer:

Vit B12 is called Cobalaamin

its is a compound of Cobalt

Cobalt shuttles between +1 +2 +3 oxidation states in all of its cobalamin complexes

But it is suplemented in the form of +3 oxidation state so Co+3 will be the answer

hope it was helpful mate !!