CBSE Class 10 Science 2019 · Paper 31/3/2 · Question 11
“Biogas is an excellent fuel.” List four reasons to justify this statement. Write the main constituent of this gas and state its percentage.
Answer
Biogas burns without smoke, leaves no residue, heats well and uses waste; its main constituent is methane, about .
Biogas is an excellent fuel because:
1. It burns without smoke, so it does not pollute the air.
2. It leaves no residue, unlike wood, charcoal and coal, which leave ash.
3. Its heating capacity is high.
4. It is made from cow-dung and other waste, so producing it is an efficient method of waste disposal, and the slurry left behind is used as manure.
The main constituent of biogas is methane (), which makes up about (up to ) of the gas.
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