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

Marsh gas

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Mustard gas

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Laughing gas

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Propane

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Solution

The correct option is A
Marsh gas

The activity of anaerobic bacteria on sewage produces biogas, commonly called gobar gas or marsh gas. The major component of biogas is methane. It also includes other gases like carbon dioxide, hydrogen, nitrogen, oxygen and hydrogen sulphide.

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