Which one of the following reactions does not | vedclass

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(C) During the extraction of copper from copper pyrites $(CuFeS_2)$,the ore is roasted to remove impurities. $2 CuFeS_2 + O_2 \rightarrow Cu_2S + 2 Fe

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$CaO + SiO_2 \rightarrow CaSiO_3$

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(C) During the extraction of copper from copper pyrites $(CuFeS_2)$,the ore is roasted to remove impurities. $2 CuFeS_2 + O_2 \rightarrow Cu_2S + 2 FeS + SO_2$ $2 Cu_2S + 3 O_2 \rightarrow 2 Cu_2O + 2 SO_2$ $2 FeS + 3 O_2 \rightarrow 2 FeO + 2 SO_2$ $FeO + SiO_2 \rightarrow FeSiO_3$ (Slag formation) Calcium oxide $(CaO)$ is not used as a flux in the extraction of copper because the impurity present is iron oxide $(FeO)$,which is acidic in nature and requires a basic flux like $SiO_2$. Therefore,the reaction $CaO + SiO_2 \rightarrow CaSiO_3$ does not occur.

Which one of the following reactions does not occur during the extraction of copper?

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