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On which of the following properties does the coagulating power of an ion depend?

1. The magnitude of the charge on the ion alone
2. Size of the ion alone
3. The sign of charge on the ion alone
4. Both magnitude and sign of the charge on the ion

Correct answer: Both magnitude and sign of the charge on the ion

Solution

The coagulating power of an ion depends on both the magnitude and the sign of its charge, as per the Hardy-Schulze rule. Higher charge and opposite sign to the colloidal particle enhance coagulation.

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