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Which property makes activated carbon suitable?

  • A.Its density, which allows a large mass to be contained within a small volume and therefore to store more vapour
  • B.Nothing
  • C.A vast surface within its pores, so a modest mass adsorbs a large quantity of hydrocarbon vapour
  • D.An enormous internal surface area

Answer: D

A gram of activated carbon has a surface area measured in hundreds of square metres. The last option explains exactly that property, which makes it a correct and more instructive 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. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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