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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsMedium
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When water is added to calcium oxide, one product forms and heat is released. What is the correct combined identification?

Answer and explanation

Correct answer: Combination and exothermic

Calcium oxide reacts with water as CaO + H₂O → Ca(OH)₂. Two reactants combine to produce a single product, calcium hydroxide, so the reaction is a combination reaction. Because heat is released to the surroundings, it is also exothermic. Therefore, option A correctly identifies both features; the other options describe different reaction types or energy changes.

Related tags

ScienceClass10Chemical-ReactionsCombination-ReactionExothermic-ReactionChemical 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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