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Q.

The dispersed phase in colloidal iron (iii) hydroxide and colloidal gold positively and negatively charged respectively which of the following statement is not correct

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a

MgCl2 solution can coagulate the gold sol more readily than the iron (III) hydroxide sol

b

Na2SO4 causes coagulation in both sols.

c

Mixing the two sols has no effect

d

Coagulation of both the sols can be brought about by electrophoresis

answer is C.

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Detailed Solution

The dispersed phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged respectively. When two solutions are mixed, they will affect mutual coagulation. This is because the charge on one sol is neutralized by the opposite charge on the other sol. Hence, statement C is not correct.

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