Which compound is responsible for the formation of a blue precipitate when ferric ions react with a Lassaigne's extract or potassium ferrocyanide solution?

  • A
    $K_4[Fe(CN)_6]$
  • B
    $Fe_4[Fe(CN)_6]_3$
  • C
    $KMnO_4$
  • D
    $Fe(OH)_3$

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