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(C) Limestone $(CaCO_3)$ decomposes to $CaO$,which reacts with silica $(SiO_2)$ impurity to form calcium silicate $(CaSiO_3)$ slag: $CaO + SiO_2 \righ

Vedclass · Accepted Answer

$A, B, C$

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(C) Limestone $(CaCO_3)$ decomposes to $CaO$,which reacts with silica $(SiO_2)$ impurity to form calcium silicate $(CaSiO_3)$ slag: $CaO + SiO_2 \rightarrow CaSiO_3$. This is correct.$(B)$ Pig iron is the iron obtained from the blast furnace,which contains about $4 \%$ carbon and many impurities like $S, P, Si, Mn$. This is correct.$(C)$ In the hotter part of the furnace,coke reacts with $CO_2$ to produce $CO$: $C + CO_2 \rightarrow 2CO$. This is correct.$(D)$ Exhaust gases consist mainly of $N_2$ and $CO$,not $NO_2$. This is incorrect.

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