Question

Which of the following is the main component of biogas ?

• A. Carbon dioxide
• B. Hydrogen sulphide
• C. Water vapour
• D. Methane

Hint:

Do not confuse biogas with other fuel gases. The main component of Biogas and CNG is Methane (\(CH_4\)), while the main component of LPG is Butane (\(C_4H_{10}\)).

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Biogas is a type of biofuel that is produced from the breakdown of organic matter (such as animal waste, plant material, and sewage) in the absence of oxygen, a process called anaerobic digestion.

Step 2: Detailed Explanation:
The composition of biogas can vary depending on the feedstock and production conditions, but it typically consists of: \[\begin{array}{rl} \bullet & \text{Methane (\(CH_4\)): 50% - 75% (This is the primary flammable component that makes biogas a useful fuel).} \\ \bullet & \text{Carbon dioxide (\(CO_2\)): 25% - 50%} \\ \bullet & \text{Trace gases: Small amounts of Nitrogen (\(N_2\)), Hydrogen (\(H_2\)), Hydrogen sulphide (\(H_2S\)), and Water vapour (\(H_2O\)).} \\ \end{array}\] Since methane constitutes the largest percentage of the gas mixture, it is considered the main component of biogas.

Step 3: Final Answer:
The main component of biogas is Methane.