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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsHard
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In the reaction of calcium oxide with water, only one product is formed and heat is released. What is the correct combined classification of this reaction?

Answer and explanation

Correct answer: Combination and exothermic

The reaction is \(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2 + heat}\). Calcium oxide and water combine to form a single product, calcium hydroxide; therefore, it is a combination reaction. Since heat is released, it is exothermic. In contrast, in a decomposition reaction, one compound breaks down into two or more substances.

Related tags

ScienceClass 10Chemical ReactionsCombination ReactionExothermic ReactionCalcium Oxide
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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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