Burning is the result of which type of reaction?

• A. Chemical
• B. Physical
• C. Nuclear
• D. Electrochemical

Answer: (A)

Burning is a chemical reaction called combustion, where a fuel reacts with an oxidizer (usually oxygen in the air) to form new substances such as carbon dioxide and water, releasing heat and light. This is a chemical change because the original materials are transformed into different substances, and you can’t simply reverse it by physical means.

Physical changes, by contrast, only alter form or state without creating new substances—for example, melting ice or tearing paper. Nuclear reactions involve changes in atomic nuclei and release energy from those nucleus-level processes, which is not what we see in ordinary fires. Electrochemical reactions are redox processes that occur in devices like batteries or during corrosion, not typical burning. So the burning you observe is the result of a chemical reaction.