Which among the following is considered as the cleanest fuel?
(a) cow dung cake (c) kerosene
(b) petrol (d) hydrogen gas
NCERT Class VIII
Science - Exemplar Problems
Chapter 6. Combustion and Flame
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36
(d) hydrogen gas.............................Is the answer
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Hydrogen is the cleanest fuel.
EXPLANATION:
Clean fuels are the ones that do not cause any type of pollution and do not harm the air quality in any manner when they burn.
When hydrogen burns in air, it produces only "water vapour" and nothing else. The burning of hydrogen does not cause any type of pollution. Because of the fact that it is a clean fuel, hydrogen is being considered as an alternative fuel for various purposes .
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