What do you mean by exothermic and endothermic reaction

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What does one mean by exothermic and endothermic reactions? Give examples.

NCERT Solutions for Class 10th Science Chapter 1 Chemical Reactions and Equations Exercise 9
NCERT Class X
Science - Science
Chapter_Chemical Reactions and Equations

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Reaction in which heat energy is liberated by the reactants is called exothermic reaction.
  eg:   Carbon + Oxygen gives  Carbon Dioxide + Q

reaction in which heat energy is absorbed by the reactants is called endothermic reaction.
eg:  Nitrogen + Oxygen gives 2 nitrous oxide (2NO)  -  Q




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