Topic: Lyophilic and lyophobic sols· Principles Related to Practical Chemistry

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. Both magnitude and sign of the charge on the ion

3. Size of the ion alone

4. The sign of charge on the ion alone

Doubtly Asked 30 Oct 2026 NEET UG 2018 neet Save WhatsApp Report

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Answer: 2. Both magnitude and sign of the charge on the ion

According to the Hardy-Schulze rule, the ion that coagulates a colloid is the one carrying charge opposite to the colloidal particles, and its power rises rapidly with the magnitude of that charge.

So both the sign (it must be opposite to the sol) and the magnitude of the charge matter. For a negative sol, \(\mathrm{Al^{3+}}>\mathrm{Ba^{2+}}>\mathrm{Na^+}\). Size alone, or only sign or only magnitude, is not enough.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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

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