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7th Class Science Physical and Chemical Changes Question Bank Physical and Chemical Changes

  • question_answer
    Liquefied Petroleum Gas (L.P.G) used as kitchen fuel is supplied in the liquid form in the gas cylinders. When it comes out from cylinder it comes out as a gas which bums. Which of the following statements is correct?

    A) The process of conversion of liquid to gas involves a chemical change.

    B) The process of burning gas is a chemical change.

    C) Both the above are correct.

    D) None of these

    Correct Answer: B

    Solution :

    The process in statement (a) is a physical change as the liquid changes to a gaseous state and no new substance is formed. In statement (b), LPG bums to form a new substance so it is a chemical change.


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