Colloidal $Fe(OH)_3$ and colloidal gold are positively and negatively charged sols,respectively. Which of the following statements is $NOT$ correct?
- AMagnesium chloride solution coagulates the gold sol.
- BSodium sulfate solution will cause coagulation in both sols.
- CMixing the two sols will have no effect.
- DElectrophoresis will cause coagulation in both sols.
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