61. The gas produced in marshy places due to decomposition of vegetation is A.Carbon monoxide B.Carbon dioxide C.Sulphur dioxide D.Methane
Answer: Option D Solution: Methane gas is a hydrocarbon gas largely composed of methane formed when organic material or vegetation decays in the absence of air. Naturally occurring methane is mainly produced by the process of methanogenesis. It is also known as Swamp Gas.
