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Which of the following statements is/are true for hydrophilic (lyophilic) sols?

1. They do not require added electrolytes for stability.
2. Their coagulation is reversible.
3. Their viscosity is similar in order of magnitude to that of pure water.
4. Their surface tension is usually lower than that of the dispersion medium.

Correct answer: They do not require added electrolytes for stability.

Solution

Hydrophilic sols are stabilized by their strong interaction with the solvent (water), not by added electrolytes. Their coagulation is reversible. Their viscosity is much higher than pure water (not similar). Their surface tension is generally lower than the dispersion medium. Statements 1, 2, and 4 are correct; statement 3 is incorrect.

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