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6th Class Science Changes Around us Question Bank Changes Around us

  • question_answer
    DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 1 Copper statues exposed to carbon dioxide and water in the air become coated with patina. The patina is not copper, it is not carbon dioxide, and not water. It is a new substance formed by the reaction of these chemicals with one another. The change described above is a

    A) reversible change

    B) irreversible change

    C) expansion

    D) contraction

    Correct Answer: B

    Solution :

        It is a chemical change so it is irreversible change.


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