Major component of biogas is :

Question

Accepted Answer

Biogas is a renewable energy source produced through the anaerobic digestion of organic matter, such as animal manure, agricultural waste, and food waste. The major component of biogas is methane (CH4), which is why Option 4 is the correct answer.

1. **Explanation for Option 4 (CH4):**
   - Methane (CH4) is the primary component of biogas, typically making up about 50-75% of its composition. It is the main energy carrier in biogas, responsible for its combustibility and energy content. Methane is a simple hydrocarbon and is highly efficient as a fuel, making it the most significant component of biogas for energy production.

2. **Explanation for why other options are incorrect:**
   - **Option 1 (H2S):** Hydrogen sulfide (H2S) is present in biogas but only in trace amounts, usually less than 1%. It is a byproduct of the digestion process and is considered an impurity that needs to be removed due to its corrosive nature and unpleasant odor.
   - **Option 2 (N2O):** Nitrous oxide (N2O) is not a component of biogas. It is a greenhouse gas that is not typically produced in the anaerobic digestion process used to generate biogas.
   - **Option 3 (CO2):** Carbon dioxide (CO2) is indeed a significant component of biogas, making up about 25-50% of its composition. However, it is not the major component. While CO2 is present in substantial amounts, it does not contribute to the energy content of biogas like methane does.

In conclusion, methane (CH4) is the major component of biogas, making Option 4 the correct answer. It is the primary source of energy in biogas, distinguishing it from other gases present in the mixture.