Which among the following is an example of an exothermic reaction?
Combustion of petrol
An exothermic reaction releases energy, usually as heat (and light), to the surroundings.
Combustion of petrol is the burning of hydrocarbons in oxygen to form carbon dioxide and water, releasing a large amount of heat — this is why it powers engines. It is a classic exothermic reaction.
Photosynthesis absorbs light energy to make glucose, so it is endothermic. Melting of ice and evaporation of water absorb heat (latent heat) and are physical changes, not exothermic reactions.
Hence, the answer is Combustion of petrol.
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Important Questions from Basic Concepts of Chemistry
- Which law states that a compound always contains the same elements in the same proportion by mass?
- Which of the following is NOT applicable to the Law of Constant Proportion?
- Which of the following best differentiates a mixture from a compound?
- Which of the following is an element?
- Which of the following best defines a heterogeneous mixture?
