First slide

General methods of extraction of elements from the earth crust

Question

The chief reaction(s) occurring in blast furnace during extraction of iron from haematite is/are:

Moderate

A

${Fe}_{2} O_{3} + 3 CO \to 2 Fe + 3 {CO}_{2}$
B

$FeO + {SiO}_{2} \to {FeSiO}_{3}$
C

${Fe}_{2} O_{3} + C \to 2 Fe + 3 CO$
D

$CaO + {SiO}_{2} \to {CaSiO}_{3}$

Solution

In extraction of Fe, Fe₂O₃ is primary reduced by CO below 710^oC and acidic impurity of SiO₂ is removed in the form of slag (CaSiO₃).

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