A complex has a composition correspondin...

A complex has a composition corresponding to the formula `CoBr_(2)Cl.4NH_(3)`. What is the structural formula if conductance measurements show two ions per formula unit ? Silver nitrate solution given an immediate precipitate of AgCl but AgBr :-

`[CoBrCl(NH_(3))_(4)]Br`

`[CoCl(NH_(3))_(4)]Br_(2)`

`[CoBr_(2)Cl(NH_(3))_(4)]`

`[CoBr_(2)(NH_(3))_(4)]Cl`

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