Question

Marsh gas mainly contains:
(A)CO
(B)${{H}_{2}}S$
(C)${{C}_{2}}{{H}_{2}}$
(D)$C{{H}_{4}}$

Answer 1

Hint: Marsh gas is found in marshy areas and also produced by ruminants gut. It is sometimes visible at night and is formed due to action of bacteria and decaying of matter in marshes.

Complete step by step answer:
Marsh gas is a gaseous decomposition of organic matter, it consists of methane, hydrogen sulphide and carbon dioxide produced mainly within some geographical marshes, swamps, and bogs. It consists primarily of methane. Marsh gas is produced by the anaerobic bacterial decomposition of vegetable matter and the rumen of herbivorous animals. It has the ability to self ignite, which is present in marshes and is visible mainly at night. The marsh gas has 50 to 80 percent methane gas.
Considering other options, Carbon monoxide, it is a poisonous gas, and mainly produced during incomplete combustion of methane gas. Also produced by gasoline, wood, propane, charcoal and other fuel. Inhaling carbon monoxide could give fatal outcomes.
Ethylene gas is a colorless flammable gas with a faint sweet and musky odour. Natural sources of ethylene gas are petroleum and natural gas.
Hydrogen sulphide is a gas that is commonly found in mining regions. It is found during drilling and production of crude oil and natural gas. It is also found in wastewater treatment and utility facilities and sewer. The gas is produced by the breakdown of microbial organic materials occurring in absence of oxygen. It is colorless, flammable, corrosive and odour is similar to rotten egg smell.


Note: Methane is also a greenhouse gas and is now 84 times more potent than Carbon dioxide. Its habit of absorbing heat effectively, increases the damage of greenhouse effect , by warming the earth's surface rapidly.