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Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not?

Hydrogen is a cleaner fuel than CNG because it does not give carbon dioxide on burning. Insufficient combustion does not take place.
However, it cannot be replaced for CNG till proper devices are developed for its use as a domestic fuel.

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Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not?