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    Chemistry
    Grade-10
    Easy

    Question

    Which equation is a double displacement reaction?

    1. Cl2 + 2KI → 2KCl
    2. Fe + O2 → Fe2O3
    3. CaCO3 → CO2 + CaO
    4. CaCO3 + 2HCl → CaCl2 + H2CO3

    hintHint:

    A double displacement reaction is a type of chemical reaction in which the reactant ions exchange their places to form new products. 

    The correct answer is: CaCO3 + 2HCl → CaCl2 + H2CO3

      CaCO3 + 2HClrightwards arrow CaCl2 + H2CO3 is double displacement reaction.
      • In a double displacement reaction, two compounds exchange ions to form different, or new, compounds.
      • In the reaction, the two reactants exchange ions forming different compounds.

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