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Biology
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28/10/2021 12:51 pm
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During sewage treatment, biogases are produced which include
(1) hydrogen sulphide, nitrogen, methane
(2) methane, oxygen, hydrogen sulphide
(3) methane, hydrogen sulphide, carbon dioxide
(4) hydrogen sulphide, methane, sulphur dioxide
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28/10/2021 12:53 pm
Correct answer: (3) methane, hydrogen sulphide, carbon dioxide