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An cationic complex has two isomers A an...

An cationic complex has two isomers A and B . Each has one `Co^(3+)`, five `NH_3` , one `Br^(-)` and one `SO_4^(2-)` . A gives a white precipitate with `BaCl_2` solution while B gives a yellow precipitate with `AgNO_3` solution.
(a) What are the possible structures of the complexes A and B ?
(b) Will the two complexes have same colour ?

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