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9th Class Science Is Matter Around Us Pure Question Bank MCQs - Is Matter Around us Pure

  • question_answer
    The most suitable technique used to separate mixture of different gases from bulk of air, can be

    A) chromatography

    B) sublimation

    C) fractional distillation

    D) centrifugation

    Correct Answer: C

    Solution :

    [c]
    Fractional distillation method is used to separate different gases present in air.
    The air is passed through fractional distillation column where gases warm up slowly and separate at different levels according to their boiling point, e.g.
    Nitrogen gas is separated \[-196{}^\circ \text{ }C\].
    Argon at \[-186{}^\circ \text{ }C\] and oxygen at \[-183{}^\circ \text{ }C\].
    Hence, (c) is the correct option.


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