Question

A major component of gobar gas is
A. Ethane
B. Butane
C. Ammonia
D. Methane

Answer 1

Biogas is a naturally occurring gas that is generated by the anaerobic breakdown of organic matter. It is an alternative source of energy that utilizes organic wastes like sewage waste, green waste, manure, etc. It is a renewable source of energy as it does not require the burning of fossil fuels. Carbon dioxide along with the simplest alkane gas is a component of biogas.

Complete answer:
Biogas is a renewable energy source that is made from the breakdown of organic molecules in absence of oxygen. Anaerobic bacteria digest organic waste to make biogas. The raw material for biogas can be an agricultural waste, plant material, sewage waste, green waste, food waste, manure, etc.
Biogas is primarily composed of methane gas and carbon dioxide with trace elements like carbon monoxide, nitrogen, and hydrogen. $50-80$ percent of biogas is made of methane gas which is the simplest alkane gas. $20-50$ percent is carbon dioxide.
Biogas can be prepared in closed containers or fermentors by anaerobic digestion. Landfills can also be used to prepare biogas. Biogas can be used in combustion engines to generate electricity or burn to produce heat. Biogas also provides environmental profits as accumulated animal waste, municipal waste, and other waste can be used efficiently. Also, the by-products obtained from biogas production can be used as manure in fields. It is an environmentally friendly process. Biogas can easily be produced in household digesters and can be used for cooking as fuel.

Therefore, from the above discussion, we can conclude that option D) is the right answer.

Note: Biogas can be used to power motor vehicles by compressing it after the removal of carbon dioxide. The raw biogas contains traces of hydrogen sulfide which can corrode machinery if used directly as fuel. Thus, it needs to be purified and processed for the removal of hydrogen sulfide.