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Subject - Chemistry:

Basics

MCQ - 608-2794

Question:

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

  1. Hydrogen and Oxygen
  2. Oxygen and Acetylene
  3. Methane and Air
  4. Oxygen and Acetylene

Correct Answer: C

Explanation:

Sol. Generally, Carbon Monoxide, Carbon, Dioxide, Methane, Oxygen, Nitrogen and Hydrogen gases etc. are found in mines. When combined with air, they cause an explosion. 5.15% of the amount of methane in air is explosive. In air, 12.5-74% presence of carbon monoxide is explosive. In air, 4-74% carbon and hydrogen mixture may blast. Mostly in the above options, in mines, methane and air mixture is explosive.

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