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  3. 8th Class
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  5. Combustion and Flame

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

  • question_answer
    Incomplete combustion of fossil fuels releases a gas 'X?. This gas is poisonous in nature and it bums with a blue flame. Which gas does X represent?

    A)  Ozone                 

    B)  Chlorine

    C)  Carbon dioxide               

    D)  Carbon monoxide

    Correct Answer: D

    Solution :

      Incomplete combustion of fossil fuels leads to the formation of carbon monoxide. Carbon monoxide can be poisonous if inhaled in large quantities. It burns with a blue flame. The correct answer is D.


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