Question

Which among the following are constituents of biogas?

• A. Oxygen
• B. Carbon dioxide
• C. Methane
• D. (b) and (c) above.

Answer 1

The correct option is D (b) and (c) above.

Biogas consists mainly of methane (${\text{CH}}_4$), carbon dioxide (${\text{CO}}_2$), and traces of hydrogen sulphide (${\text{H}}_2\text{S}$) along with nitrogen (${\text{N}}_2$), hydrogen (${\text{H}}_2$), and oxygen (${\text{O}}_2$). It is the mixture of the gases produced by the decomposition of organic matter in the absence of air (oxygen). Biogas can be produced from agricultural waste like weeds, as well as from domestic waste such as vegetable peels and meat scraps.