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Which of the following chemical equations represents a combination reaction?

Answer and explanation

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

In a combination reaction, two or more reactants combine to form one product. Here, \(\mathrm{CaO}\) and \(\mathrm{H_2O}\) combine to form only \(\mathrm{Ca(OH)_2}\), so option A is correct. In contrast, in option B one compound breaks down into \(\mathrm{KCl}\) and \(\mathrm{O_2}\), so it is a decomposition reaction.

Related tags

Chemical ReactionsCombination ReactionChemical EquationsReaction TypesClass 10 Science

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