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Which fuel is a mixture of propane and butane?

  • A.Liquefied petroleum gas, a by-product of refining and gas processing which liquefies under modest pressure
  • B.Liquefied petroleum gas
  • C.Compressed natural gas, which is principally methane and is stored at a very high pressure on the vehicle
  • D.Biodiesel

Answer: B

Liquefied petroleum gas liquefies at a few bar, unlike methane. The last option explains exactly that property, which makes it a correct and more detailed version of the same answer. Naming what changes and what stays the same is the reliable route through questions of this shape. The order in which the effects act is what decides the outcome, so it is worth establishing first. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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