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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?

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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?

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Hydrogen gas burns and produce steam. Because of this environment is not polluted. Hence it is used in rockets as fuel. But this gas is explosive. It is not a cleaner fuel than CNG. Because CNG is cleaner than the other sources of energy.

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