The dispersed phase in colloidal iron (Ill) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statements is not correct?

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Coagulation in both sols can be brought about by electrophoresis.

Mixing the sols has no effect.

Sodium sulphate solution causes coagulation in both sols.

Magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol

answer is B.

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Detailed Solution

Colloidal gold and colloidal iron (III) hydroxide both have positively and negatively charged dispersion phases.
The mutual coagulation of two solutions results from their combination. This is because the opposite charge on the other sol balances out the charge on the first sol. As a result, statement B is untrue.

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