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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsMedium
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If heat is written on the reactant side of a chemical equation, what type of reaction is it?

Answer and explanation

Correct answer: Endothermic reaction

The governing idea is whether a reaction absorbs or releases energy. Heat written on the reactant side is consumed during the reaction, so the process is endothermic and option A is correct. An exothermic reaction releases heat and places it among the products. Displacement and precipitation identify chemical patterns, but they do not answer the energy-change question.

Related tags

ScienceClass10Chemical ReactionsEndothermic ReactionHeat AbsorptionChemical 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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