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When silver nitrate reacts with potassium iodide to form a colloidal solution of [AgI]⁻, this negatively charged sol is produced only if potassium iodide is in excess. The maximum millimoles of KI are observed in option (2) (50 × 2 = 100). Which statement is accurate?

1. Correct.
2. Incorrect.
3. Partially correct.
4. Indeterminate.

Correct answer: Correct.

Solution

The negatively charged colloidal sol [AgI]⁻ forms when KI is in excess, as iodide ions adsorb on the AgI surface, imparting a negative charge. The statement aligns with the given condition.

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