If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains Options: A . &nbspHydrogen sulphide B . &nbspCarbon dioxide C . &nbspMethane D . &nbspOxygen

If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minut

Question

If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains

Options:

A . Hydrogen sulphide

B . Carbon dioxide

C . Methane

D . Oxygen

Answer: Option B

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