In gobar gas, the maximum amount is that of

In gobar gas, the maximum amount is that of
  1. butane
  2. methane
  3. propane
  4. carbon dioxide

Solution

Biogas is a methane rich fuel gas produced by anaerobic breakdown of biomass with the help of methanogenic bacteria. It is composed of methane (50-70\%), $\mathrm{CO}_2$ (30-40\%) and traces of $\mathrm{H}_2, \mathrm{~N}_2$ and $\mathrm{H}_2 \mathrm{~S}$.

Asked in: NEET 2012 (Mains)

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