Question

Which gas is mainly responsible for explosions in coal mines?

• A. Carbon monoxide
• B. Carbon dioxide
• C. Methane
• D. Hydrogen sulphide

Hint:

Methane explosions are prevented by proper mine ventilation and continuous gas monitoring.

Answer 1

The Correct Option is C

Step 1: Understanding mine gases.
Coal mines contain various gases known as mine gases, such as methane, carbon monoxide, carbon dioxide, and hydrogen sulphide. Some of these gases are toxic, while others are explosive in nature.
Step 2: Properties of methane.
Methane is a colourless, odourless, and highly inflammable gas released naturally from coal seams. When mixed with air in certain proportions (about 5%–15%), it forms an explosive mixture.
Step 3: Cause of explosions in coal mines.
If methane accumulates due to poor ventilation and comes in contact with an ignition source such as sparks or open flames, it can cause violent explosions. Therefore, methane is considered the most dangerous explosive gas in coal mines.
Step 4: Analysis of the given options.
(A) Carbon monoxide: Highly poisonous but not primarily explosive.
(B) Carbon dioxide: An asphyxiant gas, not explosive.
(C) Methane: Correct — it is the main cause of explosions in coal mines.
(D) Hydrogen sulphide: Toxic gas but not the main cause of mine explosions.
Step 5: Conclusion.
The gas mainly responsible for explosions in coal mines is methane.