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Question

Mixture of which one of the following pairs of gases is the cause of occurrence of most of the explosions in mines?

A
Hydrogen and oxygen
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B
Oxygen and acetylene
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C
Methane and air
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D
Carbon dioxide and methane
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Solution

The correct option is D Methane and air
Methane explosions are one of the major cause of explosion in coal mines. It occurs due to the presence of build up of methane (a by product of coal) when it comes in contact with a heat source. When air contains 9.5% of methane it reaches the perfect oxidation point and explodes. So, the correct answer is 'Methane and air'.

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