I did a lab in chemistry and mixed many chemicals to discover unknown cations.?

In one part i mixed the unknown with solid kno2, and a yellow gas, NO came out. a white precipitate formed, the lab said cobalt ions are present if a yellow precipitate formed. Later I mixed a seperate portion of the unknown soln with HCl and k4(fe(CN)6), and a purple precipitate formed, the lab said if a preciitate formed, it could be white, blue, or green, then zn2 ions were present. In the soln there is only cobalt or zn ions. I need to know which it is. pleasee please help me!!