Extraction of metals and corrosion Quiz
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5 questions, one answer each
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1. Which method is used to extract aluminium from its ore?
- A. Heating with carbon
- B. Electrolysis of the molten oxide in cryolite
- C. Heating in air
- D. Reduction with hydrogen
2. What is the main reducing agent that removes oxygen from iron oxide in the blast furnace?
- A. Limestone
- B. Slag
- C. Carbon monoxide
- D. Nitrogen
3. A nail is left in boiled water covered with a layer of oil. Why does it not rust?
- A. There is no water
- B. There is no oxygen
- C. The oil is a catalyst
- D. The water is too cold
4. Why does zinc coating protect a scratched iron roof?
- A. Zinc is less reactive than iron
- B. Zinc is more reactive, so it corrodes in place of the iron
- C. Zinc is a catalyst for rusting
- D. Zinc makes the iron heavier
5. Why does aluminium not corrode quickly even though it is reactive?
- A. It is below carbon in the series
- B. It forms a thin protective layer of aluminium oxide
- C. It does not react with oxygen
- D. It is always coated in oil