A) Magnesium chloride solution coagulates the gold sol more readily than iron (III) hydroxide sol.
B) Sodium sulphate solution causes coagulation in both sols.
C) Mixing of the sols has no effect.
D) Coagulation in both sols can be brought about by electrophoresis.
Correct Answer: C
Solution :
[c] : When positive and negative sols are mixed, they coagulate each other.
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