Extraction of Metals Quiz
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5 questions, one answer each
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1. Why is gold found in the Earth as the pure metal rather than as a compound?
- A. It is too dense to form compounds
- B. It is very unreactive
- C. It has no oxide form
- D. It reacts only with carbon
2. Which method is used to extract a metal that is less reactive than carbon, such as iron?
- A. Electrolysis of the molten oxide
- B. Reduction with carbon
- C. Displacement with a more reactive metal
- D. Thermal decomposition
3. What are the three raw materials fed into a blast furnace?
- A. Bauxite, cryolite, coke
- B. Iron ore, coke, limestone
- C. Copper ore, sulfuric acid, carbon
- D. Salt, water, electricity
4. Why is electrolysis, rather than reduction with carbon, needed to extract aluminium?
- A. Aluminium oxide contains no oxygen
- B. Aluminium is more reactive than carbon
- C. Aluminium has too high a melting point for any furnace
- D. Carbon reacts explosively with aluminium oxide
5. A student compares extracting iron and aluminium and notices iron production is far cheaper per tonne. Which explanation best accounts for this?
- A. Iron ore is rarer than aluminium ore, making aluminium cheaper to mine but harder to refine
- B. Reduction with carbon (used for iron) needs much less energy than electrolysis (used for aluminium, which is more reactive than carbon)
- C. Aluminium requires more raw materials overall
- D. Iron is extracted using a cheaper form of electrolysis than aluminium