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

June 1, 2025 by rawan239

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

methane

hydrogen

carbon dioxide

hydrogen sulphide

This question was previously asked in

UPSC CAPF – 2023

Download PDF Attempt Online

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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