Which of the two is a cleaner fuel: hydrogen or CNG? Why?

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Solution

Hydrogen is a cleaner fuel than CNG. This is because the burning of hydrogen produces only water, which is harmless. However, the burning of CNG gives water and carbon dioxide, a gas that can produce the greenhouse effect in the atmosphere, harming the environment.

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Question 2
Hydrogen has been used as a rocket fuel. Would you consider it as a cleaner fuel than CNG? Why or why not?

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