$Fe(OH)_3$ sol and gold sol are positively and negatively charged,respectively. Which of the following statements is incorrect?

  • A
    Coagulation of both sols can be carried out by electrophoresis.
  • B
    Both sols can be coagulated by sodium sulfate solution.
  • C
    Mixing the two sols has no effect.
  • D
    Gold sol is coagulated more rapidly than $Fe(OH)_3$ sol by magnesium chloride solution.

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