A) methane
B) carbon dioxide
C) hydrogen sulphide
D) chlorine
Correct Answer: A
Solution :
Methane (Marsh gas) is a gaseous pollutant in minute quantity in air about 0.0002 % by volume. In nature, this is produced during decay of garbage, aquatic vegetation etc. This is also released due to burning of natural gas and from factories. Methane gas is also produced in paddy (rice) fields and is associated with global warming. Major amount of carbon dioxide is released in the atmosphere from burning of fossil fuel (coal, oil etc) for domestic cooking, heat etc. \[C{{O}_{2}}\] is confined to troposphere, thus, its higher concentration may act as a serious pollutant. It is also responsible for green house effect. At a low concentration hydrogen sulphide \[({{H}_{2}}S)\] causes headache, nausea, collapse, coma and ultimately death. Its chief sources are decaying vegetation and animal matter especially in aquatic habitats, sulphur springs, volcanic eruption, coal pits and sewers also give this gas.
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