[amp_mcq option1=”Carbondioxide” option2=”Methane” option3=”Ammonia” option4=”Carbon monoxide” correct=”option2″]
The correct answer is B. Methane.
Methane is a colorless, odorless gas that is lighter than air. It is produced by the decomposition of organic matter in the absence of oxygen. Methane is highly flammable and can cause explosions in sewers.
Carbon dioxide is a colorless, odorless gas that is heavier than air. It is produced by the respiration of animals and the burning of fossil fuels. Carbon dioxide is not flammable and does not cause explosions in sewers.
Ammonia is a colorless, pungent gas that is lighter than air. It is produced by the breakdown of proteins and urea. Ammonia is flammable and can cause explosions in sewers, but it is not as common as methane.
Carbon monoxide is a colorless, odorless gas that is heavier than air. It is produced by the incomplete combustion of carbon-containing fuels. Carbon monoxide is highly toxic and can cause death. Carbon monoxide does not cause explosions in sewers.
In conclusion, the gas which may cause explosion in sewers is methane.