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(B) In the blast furnace,the extraction of iron from haematite $(Fe_2O_3)$ involves the following key processes:$1$. Reduction of iron oxide: $Fe_2O_3

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$i$ and $iv$

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(B) In the blast furnace,the extraction of iron from haematite $(Fe_2O_3)$ involves the following key processes:$1$. Reduction of iron oxide: $Fe_2O_3$ is reduced by $CO$ to form metallic iron $(Fe)$ and $CO_2$. This is represented by reaction $i$: $Fe_2O_3 + 3CO \rightarrow 2Fe + 3CO_2$.$2$. Slag formation: The impurity $SiO_2$ (silica) is removed by adding limestone $(CaCO_3)$,which decomposes to $CaO$. $CaO$ reacts with $SiO_2$ to form calcium silicate slag $(CaSiO_3)$. This is represented by reaction $iv$: $CaO + SiO_2 \rightarrow CaSiO_3$.Therefore,reactions $i$ and $iv$ are the main reactions occurring in the blast furnace.

Among the following,the main reactions occurring in the blast furnace during the extraction of iron from haematite are:
$i$. $Fe_2O_3 + 3CO \rightarrow 2Fe + 3CO_2$
$ii$. $FeO + SiO_2 \rightarrow FeSiO_3$
$iii$. $Fe_2O_3 + 3C \rightarrow 2Fe + 3CO$
$iv$. $CaO + SiO_2 \rightarrow CaSiO_3$

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Among the following,the main reactions occurring in the blast furnace during the extraction of iron from haematite are:$i$. $Fe_2O_3 + 3CO \rightarrow 2Fe + 3CO_2$$ii$. $FeO + SiO_2 \rightarrow FeSiO_3$$iii$. $Fe_2O_3 + 3C \rightarrow 2Fe + 3CO$$iv$. $CaO + SiO_2 \rightarrow CaSiO_3$