Question

Domestic cooking gas (gobar gas) consists of mostly:
(A) methane and ethane
(B) liquefied butane and iso-butane
(C) ethylene and carbon monoxide
(D) hydrogen and acetylene

Answer 1

Biogas is the mixture of gases produced by the breakdown of the organic matter in the absence of oxygen that is anaerobically. Primarily, it consists of the simplest hydrocarbon and carbon dioxide.

Complete answer:
Bio gas is produced from raw materials such as agricultural waste, municipal waste, manure, sewage, plant waste, green waste or food waste. Biogas is a renewable energy source. Biogas is produced by anaerobic digestion with methanogen or anaerobic organisms, which digest material inside a packed or a closed system. In biogas plants, fermentation of biodegradable materials takes place. The closed or packed system is called an anaerobic digester, biodigester or a bioreactor. Biogas is primarily methane, ethane and carbon dioxide. It even has small amounts of hydrogen sulphide, moisture and siloxanes. The gases methane, ethane, hydrogen and carbon monoxide can be combusted or oxidised with oxygen. Energy is released by the combustion of these gases. Hence biogas possesses the property of being used as a fuel. Biogas can be used for cooking, heating and it can be used in a gas engine to convert energy in the gas into electricity and heat.
Therefore, domestic cooking gas or the gobar gas consists mostly of methane and ethane.

The correct answer is option A.

Note:
Biogas can be compressed after the removal of carbon dioxide, the same way natural gas is compressed as CNG and by this process biogas is used to power motor vehicles.