A cobaltamine has the formula CoCI₃ . xNH₃. This when reacted with AgNO₃ solution, one third of the chloride is precipitated. It can have the structure
a)[Co(NH₃)₆]CI₃
b)[Co(NH₃)₅]CI₂
c)[Co(NH₃)₄CI₂]CI
d)[Co(NH₃)₅H₂O]CI₃