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Which of the following chemical reactions are exothermic in nature?
Respiration
  • Decomposition of organic matter
  • Photosynthesis
    Select the correct answer using the code given below.
    • a)
      1 only
    • b)
      2 only
    • c)
      1 and 3 only
    • d)
      1, 2 and 3
    Correct answer is option 'D'. Can you explain this answer?
    Most Upvoted Answer
    Which of the following chemical reactions are exothermic in nature? ...
    Exothermic Chemical Reactions

    Exothermic reactions are those reactions in which energy is released in the form of heat or light. The following chemical reactions are exothermic in nature:

    1. Respiration
    Respiration is a process in which glucose is broken down into carbon dioxide and water. This process releases energy in the form of heat and ATP (adenosine triphosphate). Therefore, respiration is an exothermic chemical reaction.

    2. Decomposition of organic matter
    Decomposition is a process in which organic matter is broken down into simpler compounds by the action of microorganisms. This process releases energy in the form of heat. Therefore, decomposition is an exothermic chemical reaction.

    3. Photosynthesis
    Photosynthesis is a process in which carbon dioxide and water are converted into glucose and oxygen in the presence of sunlight. This process absorbs energy from sunlight and stores it in the form of glucose. However, the conversion of carbon dioxide and water into glucose and oxygen is an exothermic chemical reaction.

    Conclusion
    All the above chemical reactions are exothermic in nature. Respiration and decomposition release energy in the form of heat, while photosynthesis absorbs energy from sunlight and releases it in the form of glucose and oxygen.
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    Community Answer
    Which of the following chemical reactions are exothermic in nature? ...
    Reactions in which heat is released along with the formation of products are called exothermic chemical reactions. Exothermic reactions feel warm or hot or may even be explosive. More energy is released making chemical bonds than is used to break them.
    Examples of Exothermic Reactions:
    • any combustion reaction
    • a neutralization reaction
    • rusting of iron (rust steel wool with vinegar)
    • the reaction between water and calcium chloride
    • reaction between sodium and chlorine to make sodium chloride (table salt)
    • reaction between water and any strong acid
    • reaction between water and any anhydrous salt
    • dissolving laundry detergent in water
    • freezing water into ice cubes
    • snow forming inside clouds
    • respiration, decomposition of organic matter, photosynthesis. Hence the correct answer is option (d).
    • rain forming from water vapor in clouds
    • burning sugar
    • a burning candle
    • nuclear fission
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    Which of the following chemical reactions are exothermic in nature? Respiration Decomposition of organic matter Photosynthesis Select the correct answer using the code given below.a)1 onlyb)2 onlyc)1 and 3 onlyd)1, 2 and 3Correct answer is option 'D'. Can you explain this answer?
    Question Description
    Which of the following chemical reactions are exothermic in nature? Respiration Decomposition of organic matter Photosynthesis Select the correct answer using the code given below.a)1 onlyb)2 onlyc)1 and 3 onlyd)1, 2 and 3Correct answer is option 'D'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Which of the following chemical reactions are exothermic in nature? Respiration Decomposition of organic matter Photosynthesis Select the correct answer using the code given below.a)1 onlyb)2 onlyc)1 and 3 onlyd)1, 2 and 3Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following chemical reactions are exothermic in nature? Respiration Decomposition of organic matter Photosynthesis Select the correct answer using the code given below.a)1 onlyb)2 onlyc)1 and 3 onlyd)1, 2 and 3Correct answer is option 'D'. Can you explain this answer?.
    Solutions for Which of the following chemical reactions are exothermic in nature? Respiration Decomposition of organic matter Photosynthesis Select the correct answer using the code given below.a)1 onlyb)2 onlyc)1 and 3 onlyd)1, 2 and 3Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for UPSC. Download more important topics, notes, lectures and mock test series for UPSC Exam by signing up for free.
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