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Formation of water
used as rocket fuel
used in balloons, etc
widely debated element 
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1. Dihydrogen gas is used in the manufacture of Ammonia (NH₃) by Haber's Process.

2. It is used in the manufacture of methanol and HCl.

3. Liquid Hydrogen is used as a fuel in space rockets and in fuel cells.

4. It is used in hydrogen welding and also in oxyhydrogen flame for cutting metals.
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