NEET 2011 Biology question

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

(1)Laughing gas
(2)Propane
(3)Mustard gas
(4)Marsh gasCorrect

Answer: (4)

Solution

Anaerobic bacteria (methanogens, such as Methanobacterium) acting on sewage sludge and other organic wastes produce biogas, a mixture of methane (the main component, also called marsh gas), and

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Question ID VK-090852