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Calcination followed by carbon reduction is applicable for extracting the metal from which of the following ores?
- Sphalerite
- Dolomite
- Calamine
- Galena
Correct answer: Calamine
Solution
Calamine (ZnCO3) is first calcined: ZnCO3 -> ZnO + CO2, then the ZnO is reduced with carbon: ZnO + C -> Zn + CO. Sphalerite (ZnS) is roasted (not calcined). Dolomite is a refractory mineral not typically processed for metal extraction this way. Galena (PbS) is also roasted.
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