During sewage treatment, biogases are produced which include:

methane, hydrogen sulphide, carbondioxide

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methane, oxygen, hydrogen sulphide

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hydrogen sulphide, methane, sulphur dioxide

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hydrogen sulphide, nitrogen, methane

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Solution

The correct option is A methane, hydrogen sulphide, carbondioxide
The major constituent of biogas is methane ( $55 - 70 %$ ), CO2 ( $30 - 45 %$ ) and some traces of gases such as H2S and ammonia.

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