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

  • question_answer
    What change is observed when a piece of magnesium wire is burnt?

    A)  Physical change

    B)  Chemical change

    C)  Nuclear change

    D)  Both (A) and (B)

    Correct Answer: B

    Solution :

    During the burning of magnesium wire, magnesium reacts with oxygen to form magnesium oxide, a new substance. Hence, it is a chemical change.


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