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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsHardLevel 3

Why are both combustion and respiration considered exothermic processes?

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Answer and explanation

Correct answer: Both release energy.

In combustion, oxidation of a fuel releases energy as heat and often light. In respiration, glucose undergoes controlled oxidation and releases energy for cellular activities. Therefore, both are exothermic processes. In contrast, a process that absorbs energy is endothermic.

Tags

scienceclass10chemical reactionsexothermic reactionscombustionrespiration

Frequently asked questions

What is the correct answer to this question?

Both release energy.

Why is this the correct answer?

In combustion, oxidation of a fuel releases energy as heat and often light. In respiration, glucose undergoes controlled oxidation and releases energy for cellular activities. Therefore, both are exothermic processes. In contrast, a process that absorbs energy is endothermic.

Which subject and chapter does this question cover?

This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.

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