68. The biogas used for cooking is a mixture of which of the following? A.Carbon dioxide and oxygen B.Isobutane and propane C.Methane and carbon monoxide D.Methane and carbon dioxide
Answer: Option D Solution: Biogas is essentially a mixture of Methane (CH4, around 55-75%) but also contains Carbon Dioxide (CO2), around 25-30%), varying quantities of Water (H2O) and Hydrogen Sulphide (H2S). Other compounds can also be found, especially in waste dump biogas: Ammonia (NH3), Hydrogen (H2), Nitrogen (N2) and Carbon Monoxide (CO). Methane is the valuable component under the aspect of using biogas fuel.
