Which of the following is the purest form of iron?
Wrought iron
Wrought iron is the purest commercial form of iron, containing roughly 99.5% iron with only trace carbon (below 0.08%) and small amounts of slag.
It is produced by refining pig iron in a puddling furnace, which oxidises most of the carbon and impurities.
Hard steel and stainless steel are iron-carbon alloys with deliberate additions (carbon, chromium, nickel), so they are not pure iron.
Limonite is not a metal at all; it is a hydrated iron oxide ore (FeO(OH)·nH2O) from which iron must first be extracted.
Hence, the purest form is wrought iron.
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