Which one of the following is the largest composition in biogas ?
- A.Carbon dioxide
- B.Methane
- C.Hydrogen
- D.Hydrogen sulphide
Show answer
Biogas is mostly methane, usually about 50 to 75 per cent, and methane is the part that burns. Biogas is made when bacteria break down cattle dung, crop waste, kitchen waste or sewage in the absence of oxygen, a process called anaerobic digestion, inside a closed digester.
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