Multiple choice

Which of the following substances is the most important constituent of biogas?

  1. H2S

  2. CO2

  3. CH4

  4. H2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Biogas is primarily composed of methane (CH4), which typically makes up 50 to 75 percent of the gas mixture. Other components include carbon dioxide and trace amounts of hydrogen sulfide.

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