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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsEasy
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What type of reaction occurs when water is added to quicklime, CaO, to form calcium hydroxide?

Answer and explanation

Correct answer: Combination reaction

The reaction is \(CaO + H_2O \rightarrow Ca(OH)_2\). Two reactants, quicklime and water, combine to form only one product, calcium hydroxide; therefore it is a combination reaction. The number of products is the useful test here. It is not decomposition because nothing breaks apart, not displacement because no element replaces another, and not double displacement because two ionic compounds do not exchange ions.

Related tags

Combination ReactionQuicklimeCalcium HydroxideChemical EquationsChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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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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