Which of the following reactions is an example of a combination reaction?
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A.
2KClO3 →2KCl + 3O2
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B.
CaCO3 → CaO + CO2
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C.
2H2+ O2 → 2H2O2
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D.
NaCl + AgNO3 → AgCl + NaNO3
Correct Answer:
C. 2H2+ O2 → 2H2O2
Explanation:
A combination reaction occurs when two or more reactants join together to form a single product. In the reaction 2H2 + O2 → 2H2O, hydrogen and oxygen gases combine to form water, which perfectly fits this definition. The other options provided represent different types of chemical processes: the decomposition of potassium chlorate and calcium carbonate involve a single reactant breaking down into multiple products, while the reaction between sodium chloride and silver nitrate is a double displacement reaction where ions are exchanged between two compounds. Therefore, the formation of water from its constituent elements is the correct example of a combination reaction.
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