A compound with the empirical formula `Co(NH_(3))_(5)SO_(4)`Br exists in two forms viz red and violet forms Solution of red form gives a precipitate of `AgBr` with `AgNO_(3)` solution The violet form gives no precipitate with `AgNO_(3)` but gives white precipitate with the aquous solution of `BaCI_(2)` From the these observations give the structure of each form .

Explanation

Red form of Co `(NH_(3))_(5)SO_(4)Br` gives a ppt of AgBr with` AgNO_(3)` solutions this indicates that `Br^(Θ)` solution this indicatest that `Br^(Θ)` is ionisable and hence is present outside the coordination sphere Thus red form is `[Co(NH_(3))_(5)SO_(4)]Br`
` [Co(NH_(3))_(5)SO_(4)]Brrarr[Co(NH_(3))_(5)SO_(4)]^(o+) + Br^(Θ)`
`Ag NO_(3) + Br^(Θ) rarr AgBrbarr + NO_(3)^(Θ)`
Violet form gives no precipitate with `AgNo_(3)` i. e `Br^(Θ)` is present inside the coordination sphere along with this it gives white ppt with aqueous solution of `BaCI_(2)` this indicates that `SO_(4)^(2-)` is present outside the coordination sphere Thus violet form is `[Co(NH_(3))_(5)Br]SO_(4)`
`[Co(NH_(3))_(5)Br]SO_(4)rarr[Co(NH_(3))_(5)Br]^(2+) + SO_(4)^(2-)`
`BaCI_(2) + SO_(4)^(2-)rarr BaSO_(4)underset(White ppt)(darr+2CI^(Θ)` .