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During sewage treatment, biogases are produced which include:

1. methane, oxygen, hydrogen sulphide
2. hydrogen sulphide, methane, sulphur dioxide
3. hydrogen sulphide, nitrogen, methane
4. methane, hydrogen sulphide, carbon dioxide

Correct answer: methane, hydrogen sulphide, carbon dioxide

Solution

Sewage sludge breaks down anaerobically, producing biogas mainly composed of methane and carbon dioxide, with hydrogen sulphide as a common impurity. Oxygen and nitrogen are not typical major products of this process.

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