Which of the following gases is released mostly from landfills in urban areas? (UPSC CDS II 2016- GK Paper)

A. Nitrogen

B. Hydrogen

C. Methane

D. Oxygen

Solution: C

In landfills, waste is decomposed by the action of microorganisms that break down the organic matter. 90 to 98% of the gas released from landfills comprises of Methane and Carbon dioxide. The remaining 2 to 10% includes nitrogen, oxygen, ammonia, sulfides, hydrogen and various other gases.

Methane is also released from oil and natural gas systems, paddy fields, coal mining, stationary and mobile combustion, wastewater treatment, and certain industrial processes.

Hence, option (C) is correct.

You can download CDS I 2022 Question Papers and Answer Key. 

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