Multiple choice

Gobar gas contains mainly _______.

  1. Methane

  2. Carbon dioxide

  3. Butane

  4. Carbon monoxide
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A Correct answer
Explanation

Gobar gas (biogas from cow dung) is primarily methane (CH4), produced by anaerobic decomposition of organic matter. Methane makes up 50-75% of biogas, with the rest being CO2 and small amounts of other gases. Methane is the flammable component that allows biogas to be used as fuel.

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