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Question

Iron is obtained on a large scale from Fe2O3 by

A
Reduction with Al
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B
Reduction with CO
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C
Reduction with H2
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D
Reduction with sodium
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Solution

The correct option is B Reduction with CO
In extraction of iron from its oxide ore, hot air in blown from bottom of blast furnace so that coke is burnt to give high temperature upto 2200 K at lower portion of furnace only.
Then, CO and heat moves to upper part of furnace.
The temperature is lower in upper part where the iron oxide get reduce in different temperature.

At 500-800 K, iron oxide get reduced only by CO.
3Fe2O3+CO2Fe3O4+CO2
Fe3O4+4CO3Fe+4CO2
Fe2O3+CO2FeO+CO2

At 900-1500 K, iron oxide is reduced by both C and CO.
C+CO22CO
FeO+COFe+2CO

Limestone is added to the furnance to remove the SiO2 as slag (CaSiO3).
CaCO3CaO+CO2
CaO+SiO2CaSiO3

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