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  5. Physical and Chemical Changes

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

  • question_answer
    In which one of the following situations chemical reaction does not occur?

    A) Common salt is exposed to air

    B) Coal is burnt in air

    C) Sodium is placed in water

    D) Iron is kept in moist air

    Correct Answer: A

    Solution :

    Common salt is exposed to air


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