Biogas is formed in the

1. presence of air only
2. presence of water only
3. absence of air only
4. presence of water and absence of air

(d) presence of water and absence of air

Explanation

Biogas is a mixture of gases, like methane, carbon dioxide, hydrogen and hydrogen sulphide which is produced by the anaerobic degradation of biomass (animal and plant wastes) in the presence of water but in the absence of oxygen.

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Updated on: 10-Oct-2022

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