Which of the following is mainly produced by the activity of anaerobic bacteria on sewage?

Which of the following is mainly produced by the activity of anaerobic bacteria on sewage?
  1. Propane
  2. Mustard gas
  3. Marsh gas
  4. Laughing gas

Solution

The decomposition of sludge by anaerobic bacteria in sewage-treatment processes produces marsh gas (methane).

Asked in: NEET 2011 (Screening)

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