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

Marsh gas

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Laughing gas

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Propane

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Mustard gas

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Solution

The correct option is A Marsh gas
Methane, also called as marsh gas, is a colourless, odourless gas that occurs abundantly in nature as the chief constituent of natural gas. The decomposition of sludge by anaerobic bacteria in sewage-treatment processes produces a gas rich in methane.

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