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Question:

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

The sign of charge on the ion alone

Size of the ion alone

Both magnitude and sign of the charge on the ion

The magnitude of the charge on the ion alone

Solution:

The coagulating power of an ion depends on both magnitude and sign of the charge on the ion. The ions of the opposite sign of the charge to those present on the surface of the particles cause the precipitation of the particles. Thus, positively charged ions of the electrolyte will coagulate negatively charged particles. Similarly, negatively charged ions of the electrolyte will coagulate positively charged particles.