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      Question

      Which of the following gas usually causes explosions in

      coal-mines?
      A Propane Correct Answer Incorrect Answer
      B Methane Correct Answer Incorrect Answer
      C Fluoroethane Correct Answer Incorrect Answer
      D Diazomethane Correct Answer Incorrect Answer

      Solution

      Methane explosions occur in coal-mines when a buildup of methane gas, a by-product of coal, comes into contact with a heat source, and there is not enough air to dilute the gas to levels below its explosion point.

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