The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statements is NOT correct?
- Coagulation in both sols can be brought about by electrophoresis.
- Sodium sulphate solution causes coagulation in both sols.
- Mixing of the sols has no effect.
- Magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol.