Copper $(II)$ ions give a reddish brown precipitate with potassium ferrocyanide. The formula of the precipitate is

  • A
    $Cu_2[Fe(CN)_6]$
  • B
    $Cu[Fe(CN)_6]$
  • C
    $Cu_3[Fe(CN)_6]_2$
  • D
    $Cu_4[Fe(CN)_6]$

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