Which of the following are the components of biogas?
(A) Carbon dioxide
(B) Hydrogen sulphide
(C) Methane
(D) Carbon monoxide
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A), (B) and (C) only
Biogas is a mixture of gases made by microbes that digest organic matter without air. It is mostly methane and is used as fuel.
(A) Carbon dioxide — Correct. It is one of the gases in biogas.
(B) Hydrogen sulphide — Correct. It is also one of the gases in biogas.
(C) Methane — Correct. It is the main gas, and it makes the biogas burn.
(D) Carbon monoxide — Incorrect. It is not a component of biogas.
NCERT Extract:
Microbes in Sewage Treatment – “… The remaining major part of the sludge is pumped into large tanks called anaerobic sludge digesters. Here, other kinds of bacteria, which grow anaerobically, digest the bacteria and the fungi in the sludge. During this digestion, bacteria produce a mixture of gases such as methane, hydrogen sulphide and carbon dioxide. These gases form biogas and can be used as source of energy as it is inflammable.”