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Which of the following statements about colloids are correct?

1. The Hardy-Schulze rule is related to coagulation of colloidal solutions.
2. Brownian movement and the Tyndall effect are both exhibited by colloidal solutions.
3. When a liquid is dispersed in another liquid, the resulting colloid is called a gel.
4. The gold number is a measure of the protective power of a lyophilic colloid.

Correct answer: The Hardy-Schulze rule is related to coagulation of colloidal solutions.

Solution

Statements A, B, and D are correct. Statement C is incorrect because liquid-in-liquid is an emulsion, not a gel. The question asks for correct statements, so A, B, and D are all correct.

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