The amount of methane in biogas is approximately:
Correct answer: C. 50-75%
- A. 10-30%
- B. 50-90%
- C. 50-75%
- D. 60-75%
Explanation
Biogas is predominantly composed of methane (CH4) and carbon dioxide (CO2). The methane content typically ranges from 50% to 75% by volume. Option C accurately reflects this range. Option A suggests a much lower methane content than is typical, Option B overestimates the possible upper limit, and Option D does not encompass the full typical range, omitting the lower end.
This question appeared on the ETEA MDCAT 2018 paper, which you can sit online with every answer explained.
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