Question

explain how hydrogen gas is prepared step by step

Answer 1

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Production

Natural Gas Reforming/Gasification: Synthesis gas, a mixture of hydrogen, carbon monoxide, and a small amount of carbon dioxide, is created by reacting natural gas with high-temperature steam. ...
Electrolysis: An electric current splits water into hydrogen and oxygen.
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Answer 2

Bosch process is the process used toprepare di-hydrogen commercially. In thisprocess water gas (CO + H2, preparedfrom coal and water at 1270 K) is mixed with two times its volume of steam passed over catalyst Fe2O3, in the presence of promoter Cr2O3 or ThO2 at 773 K giving products CO2 and H2.
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