The dispersed phase in colloidal iron (III) hydroxide and collodial gold is positively and negtively charged respectively. Which of the following statement is not correct ?

Options

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

Answer

c

Explanation

Mixing of `+ve` and -ve` sols caused mutual coagulation .