A) Carbon
B) Carbon monoxide
C) Magnesium
D) Aluminium
Correct Answer: A
Solution :
Smelting: In this, calcined ore is reduced with carbon, i.e. smelted in a blast furnace. For example, Iron oxide is reduced to iron mainly by CO through perhaps some reduction by C also takes place- \[\operatorname{FeO}\left( s \right)+C\left( s \right)\to Fe\left( s/l \right)+CO\left( g \right)\] \[\operatorname{Reduction}: FeO\left( s \right)\to Fe\left( s \right)+\frac{1}{2}{{O}_{2}}\left( g \right)\] \[\operatorname{Oxidation}\,C(s)+\frac{1}{2}{{O}_{2}}(g)\to CO(g)\]
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