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9th Class Science Is Matter Around Us Pure Question Bank Is Matter Around Us Pure

  • question_answer
    The boiling points of a few gases found in air are given below:
    Element Krypton Neon Nitrogen Oxygen
    Boiling point \[\mathbf{({}^\circ C)}\]  -152 -246 -196 -183
    If liquid mixture is fractionally distilled, the order of gases distilling out is

    A) Krypton, Neon, Nitrogen, Oxygen

    B) Neon, Nitrogen, Oxygen, Krypton

    C) Nitrogen, Neon, Oxygen, Krypton

    D) Oxygen, Neon, Nitrogen, Krypton.

    Correct Answer: B

    Solution :

    The gas having lowest boiling point i.e., highly volatile will be distilled out first and the gas having highest boiling point i.e., least volatile will be distilled out at the last. So, the correct order of gases distilling out is neon, nitrogen, oxygen, krypton.


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