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Which of the following is expected to exhibit the Tyndall effect?

1. Aqueous soap solution below the critical micelle concentration.
2. Aqueous soap solution above the critical micelle concentration.
3. Aqueous sodium chloride solution.
4. Aqueous sugar solution.

Correct answer: Aqueous soap solution above the critical micelle concentration.

Solution

Above the critical micelle concentration soap molecules aggregate into micelles, a colloidal (associated colloid) system that scatters light and shows the Tyndall effect. Below CMC, and NaCl/sugar solutions, are true solutions that do not.

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