28. M/J 2015/P12/Q33
A diagram of a biogas generator is shown.
The gas, if collected, can be used as a fuel.
However, if the gas is allowed to escape it becomes an atmospheric pollutant.
What is the gas?
A carbon monoxide
B methane
C nitrogen
D sulfur dioxide
Answer: B
Explaination
When the waste material enclosed in environment where there is no oxygen, so it is broken down by microorganisms and the gas which produced is called biogas.
Decaying vegetable material produces a biogas which is methane , used as fuel.
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