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The ability of an ion to bring about coagulation of a given colloid depends upon

1. its size
2. the magnitude of its charge
3. the sign of the charge alone
4. both magnitude and sign of its charge

Correct answer: both magnitude and sign of its charge

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 magnitude and opposite sign to the colloid's charge increase coagulation efficiency.

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