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    Question

    Which of the following is a chemical

    change?
    A Heating of iron to red hot Correct Answer Incorrect Answer
    B Magnetization of an iron piece Correct Answer Incorrect Answer
    C Rusting of iron Correct Answer Incorrect Answer
    D All of the above Correct Answer Incorrect Answer

    Solution

    Rusting of iron is a chemical change because it forms a new substance (iron oxide) through a chemical reaction with oxygen and moisture. Heating and magnetization are physical changes as they don't alter the composition.

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