A) Reduction with carbon and carbon monoxide
B) Reduction with aluminium
C) Reduction with hydrogen
D) Electrolytic method
Correct Answer: A
Solution :
[a] Most metals occur in their combined state. They have to be reduced to become free metals. The choice of reducing agent is decided by the factors of energetics and economics. In this regard C is the most common reducing agent used. Carbon can be used in the form of coal, coke, charcoal and carbon monoxide, e.g :- \[Sn{{O}_{2}}+2C\xrightarrow{1473-1573K}Sn+2CO\] \[ZnO+CO\xrightarrow{1600K}Zn+C{{O}_{2}}\] \[F{{e}_{2}}{{O}_{3}}+CO\xrightarrow{823K}2FeO+C{{O}_{2}}\] \[FeO+CO\xrightarrow{1123K}Fe+C{{O}_{2}}\]
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