(i) It is produced as by-product in the cracking of oils.
(ii) In the electrolysis of brine.
(iii) In the action of steam on hydrocarbons such as methane in the presence of nickle catalyst at 8000C to yield water gas. When this gas is treated with more steam, CO2 and more hydrogen is formed. Then CO2 is removed by dissolving it in water in pressure.
Kavungya answered the question on March 25, 2019 at 10:35
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