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?
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magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol.
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sodium sulphate solution causes coagulation in both sols
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mixing the sols has no effect
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coagulation in both sols can be brought about by electrophoresis
