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| Q. |
Which is the purest commercial form of iron? |
| A. | Pig iron |
| B. | Steel |
| C. | Stainless steel |
| D. | Wrought iron |
| Answer» D. Wrought iron | |
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Explanation: Wrought iron or malleable iron is the purest form of commercial iron as it containsthe 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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