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

1. 50 mL of 1 M AgNO3 + 50 mL of 1.5 M KI
2. 50 mL of 1 M AgNO3 + 50 mL of 2 M KI
3. 50 mL of 2 M AgNO3 + 50 mL of 1.5 M KI
4. 50 mL of 0.1 M AgNO3 + 50 mL of 0.1 M KI

Correct answer: 50 mL of 1 M AgNO3 + 50 mL of 2 M KI

Solution

Negatively charged [AgI]I− sol forms when excess iodide ions (I−) are present. In option B, KI is in excess compared to AgNO3, ensuring the formation of negatively charged colloidal sol.

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