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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsEasy
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When calcium oxide is mixed with water, heat is released. Based on the heat change, what type of reaction is this?

Answer and explanation

Correct answer: Exothermic reaction

Calcium oxide reacts with water to form calcium hydroxide: CaO + H₂O → Ca(OH)₂ + heat. The important evidence is that heat is released and the mixture becomes warm, so the reaction is exothermic and option A is correct. An endothermic reaction would absorb heat and cool the surroundings. The light-driven and electricity-driven decomposition choices do not describe this heat-releasing reaction.

Related tags

ScienceClass10Exothermic ReactionCalcium OxideHeat ChangeChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour
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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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