Who knows as there are no hydrogen cars in production.
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H2 + Cl2 --------> 2HCl
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The NADPH system is the immediate source for hydrogen atoms for
the production of sugar during photosynthesis.
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Hydrogen can be obtained by electrolysis of sodium chloride
water solution.
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The production of hydrogen gas from coal has shown promise to
impact humans positively by allowing for cleaner energy production.
Hydrogen may be able to reduce pollutants that affect human health
and reduce gasses in the air such as carbon dioxide.