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    Which of the following statements is true about combination reaction?
    Question

    Which of the following statements is true about combination reaction?

    A.

    A single reactant changes to a single product.

    B.

    Only two elements react to give the products.

    C.

    A single product is formed from two or more reactants.

    D.

    Only two products are formed.

    Correct option is C

    The correct answer is: (C) A single product is formed from two or more reactants.
    A combination reaction is a chemical reaction in which two or more reactants combine to form a single product. These reactions are also known as synthesis reactions.
    General Form of Combination Reaction:
    A+B→ABA + B \rightarrow ABA+BAB
    Examples:

    Reaction of Hydrogen and Oxygen:

    2H2+O22H2O 2H_2 + O_2 \rightarrow 2H_2O

    Formation of Calcium Carbonate:

    Two reactants (calcium oxide and carbon dioxide) combine to form a single product (calcium carbonate).

    CaO+CO2→CaCO3CaO + CO_2 \rightarrow CaCO_3CaO+CO2CaCO3CaO+CO2→CaCO3​​

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