Which of the following is most active in coagulating $Fe(OH)_3$ sol,if the sol is made by hydrolysis of $FeCl_3$?

  • A
    $K_4[Fe(CN)_6]$
  • B
    $Na_2SO_4$
  • C
    $CaCl_2$
  • D
    $KNO_3$

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