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9th Class Science Matter in Our Surroundings Question Bank 9th CBSE Science Matter in Our Surroundings

  • question_answer
      The table below shows the melting and boiling points of four pure substances. Which substance is a liquid at room temperature   and   would   rapidly evaporates if left exposed to the air?
    Substance Melting Point/ Boiling Point/
    A -100 -35
    B -7 58
    C -6 225
    D 44 280

    Answer:

                      (B) and (Q are both liquids at room temperature. However (B)'s boiling point is quite close to the room temperature and it is, therefore volatile.                                          (2)


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