Name the clean fuel which can be obtained from cow-dung.

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Ethane

Carbon dioxide

Biogas

Hydrogen Supplied

answer is C.

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Detailed Solution

Concept- Biogas is a renewable, ecologically favorable energy source. It is created when microbes break down organic materials, like food or animal manure, in the absence of oxygen, a process known as anaerobic digestion.
1-Fuel - any things that can be Burned by which we can produce heat energy.
2-Clean fuel is colorless.
3-Biogas is the clean fuel which can be obtained from cow - dung .
4-For the making of the biogas , there are many gasses formed in the process for example - methane , carbon dioxide gas and many more .
5- Biogas is non-polluting gas and it is a renewable source of energy.
Hence, the correct option is 3.

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