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Q107
(IAS/2000)
Science & Technology āŗ Basic Science (Physics, Chemistry, Biology) āŗ Applied everyday chemistry
Answer Verified
Most of the explosions in mines occur due to the mixing of
Result
Your answer:
ā
Ā·
Correct:
C
Explanation
Most underground mine explosions are caused by accumulations of methane (firedamp) mixing with air and encountering an ignition source. Methaneāair mixtures are highly flammable and have a wellāknown explosive range; mixtures around 9ā10% are especially volatile, and methaneāair mixtures have been responsible for many coalāmine disasters [1]. Official mining safety reviews identify methane buildup and ventilation failures as primary causes of mine explosions, and recommend continuous methane monitoring to prevent concentrations reaching dangerous levels [2]. Industry summaries also treat firedamp as predominantly methane and a principal explosive hazard in mines. Thus, āmethane with airā is the correct choice.
Sources
- [1] https://laborcommission.utah.gov/wp-content/uploads/2019/11/Fire-Boss-Study-Guide.pdf
- [2] https://www.cdc.gov/niosh/mining/topics/fires-explosions.html
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