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A gas mixture contains CH4 C2H6 and H2 with respective concentration...

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Mine Ventilation
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A gas mixture contains CH4, C2H6 and H2 with respective concentration of 75%, 15% and 10% by volume. The lower explosibility limit of CH4, C2H6 and H2 are 5.0%, 3.3% and 4.2% respectively. The lower explosibility limit of the gas mixture, in percentage, is

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Correct Answer: Option D
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