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Question

On adding AgNO3 solution into KI solution, a negatively charged colloidal solution is obtained when they are in:

A
100 mL of 0.1 M AgNO3 + 100 mL of 0.1 M KI
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B
100 mL of 0.1 M AgNO3 + 100 mL of 0.2 M KI
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C
100 mL of 0.2 M AgNO3 + 100 mL of 0.1 M KI
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D
100 mL of 0.15 M AgNO3 + 100 mL of 0.15 M KI
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Solution

The correct option is B 100 mL of 0.1 M AgNO3 + 100 mL of 0.2 M KI
Negatively charged colloidal sol is formed when AgNO3 is completely precipitated as Agl and extra KI is absorbed on Agl.
Ag++IAgl
Agl+I[Agl]
Thus, [Ag+]<[I]

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