Heating of sulphide ore to a high temperature in presence of air
Heating of sulphide ore to a high temperature in presence of air
ARefining
BCalcination
CRoasting
DSmelting
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Correct answer is: option c) [Roasting]
Explanation: Roasting is the process of heating a sulfide ore to a high temperature in the presence of air. This converts the sulfide to an oxide, releasing sulfur dioxide as a byproduct. This is a crucial step in the extraction of many metals from their ores.
- Option A: Refining is the process of purifying a metal after it has been extracted from its ore. It aims to increase the purity of the metal by removing impurities.
- Option B: Calcination involves heating an ore to a high temperature in the *absence* or *limited supply* of air to drive off volatile substances like water or carbon dioxide. It's typically used for carbonate or hydroxide ores, not sulfide ores.
- Option D: Smelting is a process involving heating an ore with a reducing agent (e.g., coke) to extract the metal. While it can involve sulfide ores after roasting, it's not the initial heating of a sulfide ore in the presence of air.
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