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

  • question_answer
    Which of the following changes caused by heating a substance is irreversible?

    A)  Change in size

    B)  Change in state

    C)  Change in colour

    D)  Change in substance

    Correct Answer: D

    Solution :

    Changes given in (A), (B) and (C) are reversible. However, change in a substance due to heating may not be reversible. For example, when paper is burnt, ash is formed. Ash is a new substance and this change is irreversible.


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