Most of the explosions in mines occur due to the mixing of

1. hydrogen with oxygen
2. oxygen with acetylene
3. methane with air
4. carbon dioxide with ethane

Explanation

Option (c) is correct

• Coal mines contain methane (firedamp). When methane mixes with air in certain proportions (5–15%), it becomes highly explosive. A small spark can trigger an explosion.

Answer: (c) methane with air