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The protecting power of lyophilic colloidal sol is expressed in terms of

1. Coagulation value
2. Gold number
3. Critical micelle concentration
4. Oxidation number

Correct answer: Gold number

Solution

The protecting power of a lyophilic colloid is measured by the gold number, which indicates the minimum amount of lyophilic colloid required to prevent the coagulation of a lyophobic colloid like gold sol.

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