Among the reactions (a) - (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are:
(a) $\mathrm{CaO}+\mathrm{SiO}_{2} \rightarrow \mathrm{CaSiO}_{3}$
(b) $3 \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{CO} \rightarrow 2 \mathrm{Fe}_{3} \mathrm{O}_{4}+\mathrm{CO}_{2}$
(c) $\mathrm{FeO}+\mathrm{SiO}_{2} \rightarrow \mathrm{FeSiO}_{3}$
(d) $\mathrm{FeO} \rightarrow \mathrm{Fe}+\frac{1}{2} \mathrm{O}_{2}$
Correct Option: , 3
During the reduction of $\mathrm{Fe}_{2} \mathrm{O}_{3}$ to $\mathrm{FeO}$,
$\mathrm{Fe}_{2} \mathrm{O}_{3}$ is first reduced to $\mathrm{Fe}_{3} \mathrm{O}_{4}$ and then to $\mathrm{FeO}$, thus follows reaction (b).
In order to remove impurity of the ore limestone is added along with ore which is decomposed to $\mathrm{CaO}$.
The resulted $\mathrm{CaO}$ reacts with $\mathrm{SiO}_{2}$ to form $\mathrm{CaSiO}_{3}$ i.e. follows reaction (a) and is removed as a slag.
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