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Identify the exothermic reactions among the given options.  A. Photosynthesis B. Respiration C. Decomposition reactions D. Combustion of methane. 

Identify the exothermic reactions among the given options.  A. Photosynthesis B. Respiration C. Decomposition reactions D. Combustion of methane.  Correct Answer B, D

Explanation:

Exothermic Reaction

  • Exothermic reactions are reactions in which energy is released. 
  • Respiration is an example of an exothermic reaction in which energy is released which is utilized by living beings for their survival. 
  • The combustion of methane is an exothermic reaction. In fact of combustion of any fuel is an exothermic reaction. 

Endothermic Reaction

  • The reactions in which energy is absorbed are called endothermic reactions. 
  • In photosynthesis, energy is absorbed in form of carbohydrates. 
  • All decomposition reactions require energy, so energy is absorbed. So they are endothermic. 

Conclusion:

  • So exothermic reactions are Respiration and Combustion. 

Related Questions

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