Q.

Which mixture of the solutions will lead to the formation of negatively charged colloidal [AgI]I -sol?

Moderate

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answer is 2 AND 3.

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Detailed Solution

If colloidal sol of AgI is prepared by adding KI solution to AgNO3 till KI is in slightly excess, iodide ion (I-) will be adsorbed on the surface of AgI thereby giving a negative charge to the sol.In second option 50 X 10-3 moles of AgNO3 is mixed with 75 X 10-3 moles of KI. KI is excess In third option 50 X 10-3 moles of AgNO3 is mixed with 100 X 10-3 moles of KI ..KI is excess AgI + I- ⟶ AgI:I- (from KI) Negative Sol

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