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

Options

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

Explanation

On mixing two oppositely charged sols, their charges are neutralized. Hence, coagulation occurs.