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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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