General Science question from Sub Inspector exam, 2022 by JKSSB
Which of the following options is an example of chemical change?
Last updated Jun 24, 2026
Correct Answer:
Option C —
Burning of coal
Why Burning Coal is a Chemical Change
When coal burns, it isn't just changing shape or state; it is undergoing a chemical reaction. The carbon in the coal reacts with oxygen in the air to form entirely new substances, such as carbon dioxide ($CO_2$), water vapor, and ash.
A chemical change is defined by:Irreversibility: You cannot easily turn ash and smoke back into a piece of coal.New Substances: The molecular structure of the starting material is permanently altered.Energy Release: Large amounts of heat and light are typically produced.
Answer verified by Quintessence Classes faculty — Karan Nagar, Srinagar.
