Answer: Shifting CO with steam to CO2, then absorbing it.
- A Cooling the mixture below CO's boiling point
- B Bubbling the gas through concentrated H2SO4
- C Shifting CO with steam to CO2, then absorbing it
- D Reacting the mixture directly with nitrogen gas
Correct answer: C. Shifting CO with steam to CO2, then absorbing it
Explanation: In the water-gas shift CO + H2O reacts over iron chromate to give CO2 + H2; the CO2 is then scrubbed out under pressure, leaving pure dihydrogen.
Each water molecule's O-H bonds (covalent, solid) can hydrogen-bond (dashed) to neighbouring molecules, forming an extended network responsible for water's unusually high boiling point and density anomaly.
Concept context
The simplest and most abundant element in the universe. Study its unique position in the periodic table, isotopes (protium, deuterium, tritium), properties of water and hydrogen peroxide, and industrial uses.