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    Chemistry
    Grade-10
    Easy

    Question

    Which one of the following is not an example of a combination reaction?

    1. Burning of coal
    2. Formation of water
    3. Calcium carbonate to calcium oxide
    4. None of these

    hintHint:

    When two or more reactants combine with each other to form a new product it is called a combination reaction. 

    The correct answer is: Calcium carbonate to calcium oxide

      Calcium carbonate to calcium oxide is not an example of a combination reaction.
      • The conversion of calcium carbonate (CaCO3) to calcium oxide (CaO) represents a of decomposition reaction.
      • During the reaction, CaCO3 decomposes on heating to form CaO and CO2. 

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