The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.

$\mathrm{Fe}_2 \mathrm{O}_3(\mathrm{~s})+3 \mathrm{CO}(\mathrm{g}) \rightarrow 2 \mathrm{Fe}(\mathrm{l})+3 \mathrm{CO}_2(\mathrm{~g})$

$\mathrm{CaCO}_3(\mathrm{~s}) \rightarrow \mathrm{CaO}(\mathrm{s})+\mathrm{CO}_2(\mathrm{~g})$

$\mathrm{CaO}(s)+\mathrm{SiO}_2(s) \rightarrow \mathrm{CaSiO}_3(s)$

$2 \mathrm{C}(\mathrm{s})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{CO}(\mathrm{g})$

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Which of the following elements is present as the impurity to the maximum extent in the pig iron?

Manganese

Carbon

Silicon

Phosphorus

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Concepts Covered - 0

Flux and Slag

Flux:
A chemical substance which combines with the impurities present in the roasted or calcined ore to form an easily fusible material.

$\mathrm{Fl} \mathrm{u} \mathrm{x}\: +\text {Impurity} \rightarrow \text {Slag }$

Slag:
The fusible material formed by the reaction of flux and gangue.

$\mathrm{FeO}+\mathrm{SiO}_{2} \rightarrow \mathrm{FeSiO}_{3}$ $\mathrm{FeO}+\mathrm{SiO}_{2} \rightarrow \mathrm{FeSiO}_{3}\: (\mathrm{slag})$

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