The main constituents of biogas are Options :Methane and Carbon dioxideAmmonia and Carbon dioxideHydrogen and MethaneHydrogen sulphide and Carbon monoxide

Understanding Biogas Constituents

Biogas is a renewable energy source produced through the anaerobic digestion of organic matter. The primary components of biogas significantly influence its energy content and usability.

Analyzing the Options

1. Methane and Carbon Dioxide: This is the correct composition of biogas. Methane (CH₄) typically comprises about 50-70% of biogas, while carbon dioxide (CO₂) accounts for approximately 30-50%.
2. Ammonia and Carbon Dioxide: While ammonia can be present in small amounts, it is not a main constituent of biogas.
3. Hydrogen and Methane: Hydrogen can be produced during biogas generation, but it is not a main constituent in significant amounts.
4. Hydrogen Sulphide and Carbon Monoxide: Hydrogen sulphide (H₂S) can be found in small amounts but is not a primary constituent, and carbon monoxide (CO) is not typically present in substantial quantities in biogas.

Conclusion

Given the analysis, the main constituents of biogas are Methane and Carbon Dioxide.