A) Fe
B) Cu
C) Ag
D) Al
Correct Answer: D
Solution :
[a] Fe (Iron) is obtained by reduction of oxide\[(F{{e}_{2}}{{O}_{3}})\] by carbon and carbon monoxide in blast furnace. [b] Cu (Copper) is extracted from sulphide ore by auto reduction. [c] Ag (silver) is extracted from argentiferous galena by cyanide process. [d] Al (Aluminium) is extracted by electrolysis of the oxide (alumina) dissolved in fused cryolite.
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