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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsEasy
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Which of the following reactions is an example of an exothermic reaction?

Answer and explanation

Correct answer: Calcium oxide reacting with water to form calcium hydroxide

Calcium oxide reacts with water to form calcium hydroxide and releases heat: \(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2 + heat}\). Therefore, it is an exothermic reaction. In option B, heat must be supplied to decompose calcium carbonate, so that reaction is endothermic.

Related tags

Chemical ReactionsExothermic ReactionsCalcium OxideThermal DecompositionClass 10 Science
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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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