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7th Class Science Sample Paper Science Olympiad Model Test Paper-17

  • question_answer
    When magnesium is burned in air, a powdery ash X is formed. X on dissolving in water forms Y. What are X and Y?

    A) X is magnesium hydride and Y is magnesium oxide

    B) X is magnesium hydroxide and Y is magnesium oxide

    C) X is magnesium oxide and Y is magnesium hydroxide

    D) X is magnesium carbonate and Y is magnesium bicarbonate

    E) None of these

    Correct Answer: C

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