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When a magnesium ribbon burns, the reaction is \(2Mg + O_2 \rightarrow 2MgO\). Which statement about this reaction is correct?

Answer and explanation

Correct answer: It is a combination reaction because two reactants combine to form a single product.

The governing concept is the classification of reactions by the number and nature of reactants and products. In \(2Mg + O_2 \rightarrow 2MgO\), magnesium and oxygen are two reactants, but they form only one compound, magnesium oxide. Therefore it is a combination reaction. It is not displacement or double displacement because no element or pair of ions is exchanged, and it is not decomposition because no single compound breaks apart.

Related tags

Chemical ReactionsCombination ReactionMagnesium OxideClass 10 ScienceChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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