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    Question

    Which of the following statements about colloids is NOT

    true?
    A A colloid is a heterogeneous mixture. Correct Answer Incorrect Answer
    B Particles in a colloid settle down over time, making them unstable. Correct Answer Incorrect Answer
    C Colloids exhibit the Tyndall effect. Correct Answer Incorrect Answer
    D Colloids can be separated by centrifugation. Correct Answer Incorrect Answer

    Solution

    Colloids are stable heterogeneous mixtures where the particles do not settle down when left undisturbed. They exhibit the Tyndall effect, where light is scattered by the particles. While they cannot be separated by ordinary filtration, centrifugation can be used to separate them.

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