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Lyophilic colloids are more stable compared to lyophobic colloids. They are used to stabilize lyophobic colloids, a property referred to as the protective action of lyophilic colloids, which is quantified by the gold number.

1. Correct.
2. Incorrect.
3. Partially correct.
4. Indeterminate.

Correct answer: Correct.

Solution

The statement is correct as lyophilic sols stabilize lyophobic sols by forming a protective layer around their particles, and the gold number quantifies this protective action.

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