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Question

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

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

The correct option is D Mixing of the two sols has no effect.

Mixing the sols together can cause coagulation since the charges are neutralised.


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