JEE Main 2005 Chemistry question

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?

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

Answer: (3)

Solution

Oppositely charged sols neutralise each other on mixing and coagulate (mutual coagulation), so "mixing has no effect" is not correct, option (3). (1) is correct: is

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Question ID VK-038636