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Question

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

A
positively charged sol
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B
negatively 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 positively charged sol
On treatment of AgNO3 with KI solution, AgI is formed.
AgNO3 + KI AgI + KNO3
As an excess of AgNO3 is taken, it also exists in its dissociated form as follows,
AgNO3Ag+ + NO3
These Ag+ ions are adsorbed on AgI and [AgI]Ag+ are formed. Thus, the colloidal particles acquire a positive charge.

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