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Question

During sewage treatment, gases produced include

A
Methane, hydrogen sulphide, carbon dioxide and hydrogen.
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B
Methane, oxygene and hydrogensulphide.
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C
Hydrogensulphide, methane and sulphur dioxide.
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D
Hydrogen sulphide, nitrogen and methane.
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Solution

The correct option is B Methane, hydrogen sulphide, carbon dioxide and hydrogen.
Biogas contains a mixture of different gases which are produced by the breakdown of organic matter in the absence of oxygen. Biogas is composed of methane (CH4) and carbon dioxide (CO2) and may have small amounts of hydrogen sulphide (H2S), hydrogen (H2), moisture and siloxanes.
Thus, the correct answer is option A.

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