A) butane
B) methane
C) propane
D) carbon dioxide
Correct Answer: B
Solution :
Biogas is a methane rich fuel gas produced by anaerobic breakdown of biomass with the help of methanogenic bacteria. It is composed of methane (50-70%), \[C{{O}_{2}}\](30-40%) and traces of \[{{H}_{2}},{{N}_{2}}\]and \[{{H}_{2}}S.\]
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