What are the main constituents of biogas?

What are the main constituents of biogas?

Methane and sulphur dioxide
Methane and carbon dioxide
Methane, hydrogen and nitric oxide
Methane and nitric oxide
This question was previously asked in
UPSC CDS-2 – 2017
The correct option is B) Methane and carbon dioxide.
Biogas is produced through the anaerobic digestion of organic matter by microorganisms. Its primary constituents are methane (CH₄), typically making up 50-75% of the volume, and carbon dioxide (CO₂), making up 25-50%. Methane is the main combustible component that gives biogas its value as a fuel.
Other gases present in biogas in smaller quantities may include hydrogen sulfide (H₂S), nitrogen (N₂), and hydrogen (H₂). Sulphur dioxide and nitric oxide are not typical main constituents of biogas; they are more associated with combustion processes or air pollution.
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