Which is the purest commercial form of iron? (1) Pig iron (2) Steel (3) Stainless steel (4) Wrought iron

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Answer :

(4) Wrought iron Explanation: Wrought iron or malleable iron is the purest form of commercial iron as it contains the lowest percentage of carbon (0.12-0.25%) and impurities of S, P, Mn and Si in minute amount (about 0.3%). It is made by melting cast iron with scrap iron in a reverberatory furnace lined with Fe203 which oxidizes C, Si, P, etc, most of which are then removed by rolling.

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