Biogas is considered to be an excellent fuel which burns without smoke

Biogas is considered to be an excellent fuel which burns without smoke. The main constituent of biogas is :

methane

hydrogen

carbon dioxide

hydrogen sulphide

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Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2023

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The correct answer is A. Biogas is produced by the anaerobic digestion of organic matter. Its main constituent is methane ($\text{CH}_4$).

– Biogas is primarily composed of methane (typically 50-75%) and carbon dioxide ($\text{CO}_2$) (typically 25-50%).
– Methane is the combustible component of biogas, making it valuable as a fuel.

Other gases present in biogas in smaller quantities include hydrogen ($\text{H}_2$), hydrogen sulphide ($\text{H}_2\text{S}$), nitrogen ($\text{N}_2$), and oxygen ($\text{O}_2$). The proportion of these gases varies depending on the feedstock and digestion conditions. While carbon dioxide is also a major component by volume, methane is the main constituent that provides the energy when burned.

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