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Which of the following statements about colloids is accurate?

1. (I) Lyophobic colloids cannot be created by simply combining the dispersed phase with the dispersion medium.
2. (II) In emulsions, both the dispersed phase and the dispersion medium are in liquid form.
3. (III) Micelles form when a surfactant is dissolved in any solvent at any temperature.
4. (IV) The Tyndall effect is visible in a colloidal solution where the dispersed phase and dispersion medium share the same refractive index.

Correct answer: (I) Lyophobic colloids cannot be created by simply combining the dispersed phase with the dispersion medium.

Solution

Lyophobic colloids require special preparation methods because the dispersed phase and dispersion medium do not mix easily. This makes statement (I) correct, while the other statements are either incorrect or incomplete.

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