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| Q. |
The purest form of Iron is : |
| A. | Cast iron |
| B. | Steel |
| C. | Pig iron |
| D. | Wrought iron |
| Answer» D. Wrought iron | |
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Explanation: Wrought iron is an iron alloy with a very low carbon content in Contrast to steel, and has fibrous inclusions, known as slag. This is what gives it a "grain" resembling wood, which is visible when it is etched or bent to the point of failure. Wrought iron is tough, malleable, ductile and easily welded. Historically, it was known as "commercially pure iron"; however, it no longer qualifies because current standards for commercially pure iron require a carbon content of less than 0.008 wt%. |
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