Question

    Which of the following is not a chemical

    change?
    A Combustion of fuel Correct Answer Incorrect Answer
    B Electrolysis of acidified water Correct Answer Incorrect Answer
    C Oxidation reaction of cells at the anode Correct Answer Incorrect Answer
    D Glowing of a platinum wire Correct Answer Incorrect Answer

    Solution

    Glowing of a platinum wire is a physical change because it involves only a change in state (heat-induced incandescence) without any change in the chemical composition. The rest involve chemical reactions leading to the formation of new substances.

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