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Which product of complete combustion is a greenhouse gas?

  • A.Nitrogen
  • B.Carbon dioxide, which is the unavoidable product of burning any carbon containing fuel completely in air
  • C.Carbon dioxide
  • D.Water vapour, which is harmless and is therefore not regulated by any emissions standard applying to vehicles

Answer: C

Complete combustion of a hydrocarbon yields carbon dioxide and water. The last option adds that it is unavoidable, which makes it a correct and more instructive version. Water vapour is genuinely a greenhouse gas too. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Checking which component actually carries the load settles most questions of this kind at once. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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