SSC General Science & Technology Sample Paper NCERT Sample Paper-1

  • question_answer
    Sodium bicarbonate is useful as a fire extinguisher because

    A)  It decomposes on heating to give carbon dioxide, which extinguishes fires

    B)  It releases water which extinguishes fires

    C)  It serves as a blanket for fires

    D)  It emits a foam which extinguishes fires

    Correct Answer: A

    Solution :

    [a] Baking soda is chemically known as sodium bicarbonate. When heated to a high temperature, the chemical properties of this salt make it produce lots of carbon dioxide and remove oxygen. This then totally reduces the amount of oxygen in the surrounding atmosphere and puts the fire out. This reaction also produces a small quantity of water and sodium carbonate as by-products.

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