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The disperse ...

Question

The disperse phase in colloidal iron ( $I I I$ ) hydroxide and colloidal gold is positively and negatively charged respectively. Which of the following is not correct?

A

Magnesium chloride solution coagulates the gold sol more readily than iron (

I I I

) hydroxide sol.

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B

Sodium sulphate solution causes coagulation in both sols

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C

Mixing of the 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 C Mixing of the sols has no effect
The disperse phase in colloidal iron hydroxide and colloidal gold is positively and negatively charged respectively. On mixing these two solutions the charge present on the colloidal particles will gets neutralize an they coagulate. These can also be coagulated by addingoppositelycharged ions present in the salts like sodium sulphate and magnesium chloride etc along with electrophoresis of thesolutions individually.

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