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Strongly heating a sulphide ore in air to convert it into the oxide is called what?
AAnodization
BCalcination
CLeaching
DRoasting
Answer & Solution
Correct answer: D. Roasting
1. Moderately reactive metals occur as sulphides or carbonates.
2. Heating a sulphide ore strongly in air to form the oxide is called roasting.
3. For example, 2ZnS + 3O2 gives 2ZnO + 2SO2.
4. Calcination is for carbonate ores in limited air, so it is not the answer here.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.113_
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