Specific gravity of hot metal (pig iron) is ______________ times that of the blast furnace slag ?
Correct answer: B. 3
- A. 2
- B. 3
- C. 0.8
- D. 6
Explanation
Pig iron has a specific gravity of roughly 7, whereas blast-furnace slag is about 2.3 to 2.5. Their ratio is therefore close to 3, making option b the appropriate approximate value.
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