Multiple choice

The chief constituent of biogas is ___________.

  1. methane

  2. hydrogen

  3. C2H5

  4. CO2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Biogas is primarily composed of methane (CH4), which typically makes up 50-75% of the gas mixture. Methane is the main combustible component that gives biogas its energy value. Option A correctly identifies methane as the chief constituent. Option B (hydrogen) is present only in trace amounts. Option C represents ethyl alcohol, which is not a component of biogas. Option D (CO2) is present as a non-combustible component (30-40%) but is not the chief constituent.

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