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8th Class Science Sample Paper Science Sample Paper-6

  • question_answer
    Once in a village, there was a fire in a hut. When a lot of dry powder of a substance, A was released over the fire, the fire got extinguished.                                                                                       
    (i) Name the substance A.
    (ii) How does the substance extinguished fire?
    (iii) Give another substance which behaves like substance A.

    Answer:

    (i) A is sodium bi-carbonate \[(NaHC{{O}_{3}}).\]                                                                                                           
    (ii) The heat of fire decomposes sodium bicarbonate to produce carbon dioxide gas which covers the fire like a blanket. It cuts off supply of fresh air to the burning substance. Thus, fire gets extinguished.
    (iii) Potassium hydrogels


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