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प्रश्न
Usually ______ ores are subjected to ______ which is done in the absence of air.
विकल्प
sulphide
carbonate
calcination
roasting
उत्तर
Usually carbonate ores are subjected to calcination which is done in the absence of air.
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संबंधित प्रश्न
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| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
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