Sludge is made up of matter. On decomposition, it produces .

oxygen

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organic

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biogas

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inorganic

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Solution

The correct option is C biogas
Sludge is the solid organic waste collected below the tank during primary treatment. It is passed on to a separate tank and is decomposed by bacteria. On decomposition of sludge biogas is produced. This biogas is used as fuel or to generate electricity.

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