Q.

Which of the gas is not a constituent of biogas?

A. methane
B. hydrogen
C. co2
D. so2 (sulphur di-oxide)
Answer» D. so2 (sulphur di-oxide)
Explanation: since biogas is formed by the domestic waste of home and industries, it does not contain the gases like so2, no2 etc. it does contain the hydrogen sulphide.
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