Copper (II) ions gives reddish brown pre...

Copper (II) ions gives reddish brown precipitate with potassium ferrocyanide. The formula of the precipitate is:

`Cu_(4)[fe(CN)_(6]`

`Cu_(2)[Fe(CN)_(6)]`

`Cu_(3)[Fe(CN)_(6)]`

`Cu_(3)[Fe(CN)_(6)]_(2)`

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