JKSSB Written 2022
Answer & Explanation
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Correct Answer:
Option C —
Burning of coal
Why Burning Coal is a Chemical ChangeWhen 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.