The impure iron (pig iron) that is tapped out from blast furnace contains about _____________ percent carbon?
Correct answer: C. 4
- A. 0.2
- B. 2
- C. 4
- D. 8
Explanation
Pig iron from a blast furnace usually contains about 3.5 to 4.5% carbon, together with silicon, manganese, phosphorus and sulfur. Thus approximately 4% is the suitable value.
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