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Which of the following equation represents a reaction that is both a combination reaction and an exothermic reaction?

Answer and explanation

Correct answer: \(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2}\)

In option A, calcium oxide and water combine to form a single product, calcium hydroxide, so it is a combination reaction. Heat is released when quicklime forms slaked lime; therefore, the reaction is also exothermic. In contrast, option B is a photodecomposition reaction in which one compound breaks down into simpler substances in sunlight.

Related tags

Chemical ReactionsCombination ReactionExothermic ReactionReaction ClassificationChemical Equations

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