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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsEasy
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A large amount of heat is released when water is added to calcium oxide. What type of reaction is this?

Answer and explanation

Correct answer: Exothermic reaction

Calcium oxide reacts with water to form calcium hydroxide: \(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2}\). Heat is released to the surroundings during this process, so it is an exothermic reaction. In contrast, an endothermic reaction absorbs heat from the surroundings.

Related tags

Class 10 ScienceChemical ReactionsExothermic ReactionCalcium OxideCalcium Hydroxide
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10 more MCQs
  1. 1What is the process called when one or more substances form new substances with different properties?
  2. 2Which of the following observations can be a common sign that a chemical reaction has occurred?
  3. 3What are the substances written on the left side of the arrow in a chemical equation called?
  4. 4What are the substances written on the right side of the arrow in a chemical equation called?
  5. 5Balancing a chemical equation is based on which law?
  6. 6What must be the same on the reactant and product sides of a balanced chemical equation?
  7. 7When two or more reactants combine to form a single product, what type of reaction is it?
  8. 8Calcium oxide reacts with water to form calcium hydroxide. What type of reaction is this?
  9. 9When a compound breaks down into two or more simpler substances, what type of reaction is it?
  10. 10When calcium carbonate is heated, it forms calcium oxide and carbon dioxide. What type of reaction is this?
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