A sulphide ore is converted into metal oxide by the process of:
(a) carbonation
(b) roasting
(c) calcination
(d) anodising

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Solution

(b) roasting
Sulphide ores are transformed into oxides by the process of roasting. In this process, concentrated ore is heated in the presence of surplus air. Example: Zinc blende, ZnS, a sulphide ore of zinc, is roasted in the presence of air. On roasting, zinc sulphide gets transformed into zinc oxide.

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Metal sulphide x \to Metal oxide y \to Impure metal z \to Pure metal

Sulphide ore is converted into pure metal (say $C u$ ) by following steps.

Bessemerisation $\to$ Roasting $\to$ Electrolysis

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