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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsMedium
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Which statement correctly distinguishes exothermic and endothermic reactions?

Answer and explanation

Correct answer: Exothermic reactions release heat to the surroundings, whereas endothermic reactions absorb heat from the surroundings.

In an exothermic reaction, heat flows from the reacting system to the surroundings, so the surroundings may become warmer. In an endothermic reaction, the system absorbs heat from the surroundings. Option B reverses these processes; formation of a precipitate is not a necessary feature of either type of reaction.

Related tags

ScienceClass10Chemical ReactionsExothermic ReactionsEndothermic ReactionsEnergy Change
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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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