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

  • question_answer
    DIRECTIONS: Read the following three statements and choose the correct answer. (i) Burning of magnesium ribbon is an endothermic reaction. (ii) Magnesium on burning in air forms ash. (iii) Ash formed on burning of magnesium ribbon is magnesium dioxide.

    A) Statement (i) and (iii) are incorrect but (ii) is correct

    B) Statement (i) and (ii) are incorrect but (iii) is correct

    C) All statements are correct

    D) All statements are incorrect

    Correct Answer: A

    Solution :

    Burning of magnesium ribbon is an exothermic reaction. Ash formed on burning of magnesium ribbon is magnesium oxide (MgO)


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