Correct answer
Carbon dioxide, CO₂.
Carbon dioxide, CO₂. Carbon combines with oxygen; the fuel’s hydrogen can form water. Real exhaust can also contain incomplete-combustion products and pollutants. Residual oxygen and nitrogen have not necessarily been generated by combustion: they may come from intake air. Methane or unburned fuel in exhaust does not replace CO₂ as the product of complete carbon oxidation.
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Carbon dioxide, CO₂.
Molecular oxygen, O₂, as a product of oxidising carbon.
Molecular nitrogen, N₂, as a product of oxidising carbon.
The real exam in English is a translation of the Spanish original; compare both here.
Show the Spanish original
Al quemar completamente el carbono de un combustible como la gasolina con oxígeno, ¿qué gas se forma?
- Oxígeno molecular, O₂, como producto de oxidar el carbono.
- Nitrógeno molecular, N₂, como producto de oxidar el carbono.
- Dióxido de carbono, CO₂.(Correct answer)
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