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Q.

Which of the following statements is true about AgI sol prepared by peptization of AgI with KI.

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a

In electrophoresis, the dispersed phase will move towards cathode.

b

NaCl is more effective than A12(SO4)3 for bringing about coagulation of sol.

c

On addition of NaCl in sol, the solution is stabilised

d

On persistent dialysis of sol, precipitation of colloidal sol take place (coagulation).

answer is D.

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Detailed Solution

In presence of KI,, AgI is a negative colloidal sol. Because it adsorbs I- ion on it's surface
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