A Compound with the empirical formula `Co(NH_3)_5 BrSO_4` exists in two forms : red and violet. Solution of red gives a precipitate of AgBr on addition of `AgNO_3`. The violet form Sives no precipitate on the addition at `AgNO_3` but gives a white precipitate on addition of `BaCl_2` solution. From these observations draw the structure of each compound and explain the observations.