Which one of the following metals can be extracted using carbon as reducing agent?
- A. Zinc ✓
- B. Silver
- C. Gold
- D. Aluminum
Correct Answer: A. Zinc
Explanation
Zinc can be extracted from its oxide ore using carbon (coke) as a reducing agent in a process called smelting (ZnO + C \rightarrow Zn + CO). Aluminum is highly reactive and extracted electrolytically, while gold and silver are extracted via hydrometallurgy.
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