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Question

When excess of AgNO3 is treated with KI solution, AgI forms :

A
+ve charged sol
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B
-ve charged sol
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C
neutral sol
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D
true solution
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Solution

The correct option is A +ve charged sol
If AgNO3 is added to KI medium, negatively charged sol is formed due to adsorption of iodide ions from KI onto the AgI precipitate.
If KI is added to AgNO3, postive sol is formed due to Ag+ ions in solution which get adsorbed on AgI.

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