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Question
Which of the following is not a fossil fuel?
(a) coal
(b) petroleum gas
(c) biogas
(d) natural gas
Solution
Biogas
Fossils form deep under the earth's surface from the prehistoric remains of living organisms. Biogas is a mixture of methane, carbon dioxide, hydrogen and hydrogen sulphide. It is produced by the anaerobic degradation of animal wastes such as cow dung in the presence of water.
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