As the impurities are oxidised, the melting point of iron___________________?
Correct answer: B. Increases
- A. Decreases
- B. Increases
- C. Remains unchanged
- D. May increase or decrease; unpredictable
Explanation
Oxidising impurities such as carbon, silicon and manganese removes elements that generally depress iron's melting or liquidus temperature. The composition therefore moves closer to pure iron, whose melting point is higher.
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