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Regarding the industrial manufacture of hydrogen from water gas (a mixture of CO and H2), which statement is correct?

1. CO and H2 are separated fractionally on the basis of their density difference
2. CO is eliminated by absorption in aqueous cuprous chloride solution
3. H2 is removed by occlusion in palladium
4. CO is first converted to CO2 by reaction with steam in the presence of a catalyst, and the CO2 is then absorbed in alkali

Correct answer: CO is first converted to CO2 by reaction with steam in the presence of a catalyst, and the CO2 is then absorbed in alkali

Solution

This option is correct because it describes the water-gas shift reaction, where carbon monoxide reacts with steam to produce carbon dioxide and hydrogen. The subsequent absorption of CO2 in alkali effectively removes it from the gas mixture, allowing for the purification of hydrogen.

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