Q.

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» D. Methane and carbon dioxide
Explanation: Biogas is essentially a mixture of Methane (CH4, around 55-75%) but also contains Carbon Dioxide (CO3), 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.
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