Question

Which of the following fuel does not leave ash-like residue while burning?

A. Coal B. Biogas C. Charcoal D. Wood

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Answer 1

Biogas is a  fuel that does not leave ash-like residue while burning.

Explanation:

1. Biogas is formed by the mixture of gases in the presence of water but in the absence of oxygen.
2. Biogas is a fuel that contains 75% of methane, 25% of Carbon dioxide and some traces of nitrogen and hydrogen are also present.
3. Biogas is light in nature but still has high heating capacity.
4. Biogas does not leave any residue when burns.

Answer 2

1. Biogas is made up of a mixture of gases  in the presence of water but are devoid of oxygen.
2. Methane, carbon dioxide, plus trace amounts of nitrogen and hydrogen make up biogas.
3. Biogas is a light-weight fuel with a high heating capacity.
4. When biogas is burned, it leaves no residue.
5. Coal, charcoal, and wood, on the other hand, all leave an ash-like residue.

Hence, option B is correct.

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