JEE Main Chemistry question

Not in JEE Main or NEET syllabus

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?

(A)Coagulation in both sols can be brought about by electrophoresis
(B)Mixing the sols has no effectCorrect
(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

Answer: (B)

Solution

Both sols can be coagulated by subjecting them to electrophoresis, since this drives the charged particles to an electrode where they lose their charge and coagulate (A, correct); provides both a cation and an anion, so it can coagulate the positive sol (via

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Question ID VK-144802