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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsMedium
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Which statement is correct about the reaction between calcium oxide and water?

Answer and explanation

Correct answer: One product is formed and heat is released

Calcium oxide reacts with water to form only one product, calcium hydroxide: \(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2}\). Heat is released, so this is an exothermic combination reaction. Unlike option B, it neither forms two products nor absorbs heat.

Related tags

ScienceClass10Chemical-ReactionsCalcium-OxideCombination-ReactionExothermic-Reaction
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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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