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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsEasy
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Calcium oxide reacts with water to form calcium hydroxide. What type of reaction is this?

Answer and explanation

Correct answer: Combination reaction

In the reaction \\(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2}\\), two reactants, calcium oxide and water, combine to form one product, calcium hydroxide. Therefore, it is a combination reaction. In a decomposition reaction, one compound breaks down into two or more simpler substances, whereas substances are combining here.

Related tags

ScienceClass 10Chemical ReactionsCombination ReactionCalcium OxideCalcium Hydroxide
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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. 8When a compound breaks down into two or more simpler substances, what type of reaction is it?
  9. 9When calcium carbonate is heated, it forms calcium oxide and carbon dioxide. What type of reaction is this?
  10. 10What is a decomposition reaction caused by heating called?
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