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| Q. |
Copper is refined by - |
| A. | roasting |
| B. | oxidation |
| C. | electrolysis |
| D. | zone refining |
| Answer» A. roasting | |
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Explanation: Copper is refined by the method of roasting. In the roaster, the copper concentrate is partially oxidised to produce "calcine" and sulfur dioxide gas. In roasting, the ore or ore concentrate is treated with very hot air. This process is generally applied to sulphide minerals. |
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