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Heating of ore in presence of air to remove sulphure impurities is calledA. CalcinationB. roastingC. SmeltingD. none of these

Answer» Correct Answer - B
Roasting involves heating of the ore either alone or with some other material usually in presence of air below its fusion temperature. In roasting, definite chemical changes like, oxidation, chlorination etc., take place
`2ZnS+3O_(2)rarr2ZnO +2SO_(2)`


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