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8th Class Science Combustion and Flame Question Bank Combustion and Flame Formative Objective Problems

  • question_answer
    The head of a matchstick contains a mixture of antimony trisulphide, potassium chlorate, starch, and some glue. For combustion, it is struck against a rough surface made of powdered glass and red phosphorus. Which of the following substances will be the first to get ignited when the match is struck against a rough surface?

    A)  Antimony trisulphide   

    B)  Potassium chlorate

    C)  Red phosphorus

    D)  Powdered glass

    Correct Answer: C

    Solution :

      When a match is struck against a rough surface, red phosphorus attains its ignition temperature through the heat of friction and gets converted into white phosphorous, which immediately reacts with potassium chlorate and antimony trisulphide to start combustion. The correct answer is C.                              


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