If the dispersed phases in colloidal iron (III) hydroxide and colloidal gold are positively and negatively charged respectively, which of the following statements is not correct?

Options

A. Magnesium chloride solution coagulates gold sol readily than iron (III) hydroxide sol
B. Sodium sulphate solution causes coagulation in both sol
C. Mixing of the two sols has no effect
D. Coagulation in both sols can be brought about by electrophoresis

Answer

C

Explanation

Mixing of+ve and-ve sols causes mutual coagulation.