A) methane, hydrogen sulphide and carbon dioxide
B) methane, oxygen and hydrogen sulphide
C) hydrogen sulphide, methane and sulphur dioxide
D) hydrogen sulphide, nitrogen and methane
Correct Answer: A
Solution :
Biogas is a mixture of gases (mainly methane) produced by the microbial activity and which may be used as fuel. During biogas production, the bacteria called methanogens digest the activated sludge and produce a mixture of gases such as methane, hydrogen sulphide, carbon dioxide and hydrogen,
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