Identify the reaction,which is not related to | vedclass

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(D) In the extraction of copper from copper pyrites $(CuFeS_2)$,the ore is roasted to remove sulfur as $SO_2$. $1$. $2 CuFeS_2 + O_2 \rightarrow Cu_2S

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$SiO_2 + CaO \rightarrow CaSiO_3$

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(D) In the extraction of copper from copper pyrites $(CuFeS_2)$,the ore is roasted to remove sulfur as $SO_2$. $1$. $2 CuFeS_2 + O_2 \rightarrow Cu_2S + 2 FeS + SO_2$ $2$. $2 FeS + 3 O_2 \rightarrow 2 FeO + 2 SO_2$ (Option $B$ is related to the removal of iron impurity). $3$. $FeO + SiO_2 \rightarrow FeSiO_3$ (Option $C$ is the slag formation step to remove iron). $4$. $2 Cu_2S + 3 O_2 \rightarrow 2 Cu_2O + 2 SO_2$ (Option $A$ is the partial oxidation of copper matte). Option $D$ $(SiO_2 + CaO \rightarrow CaSiO_3)$ is a reaction used in the extraction of iron (blast furnace) to remove acidic impurities like $SiO_2$ using basic flux $CaO$. It is not related to copper extraction.

Column-$I$	Column-$II$
$P$. Nitriding	$I$. Process of heating steel to redness and then cooling it very slowly
$Q$. Annealing	$II$. Process of heating steel in presence of $NH_3$ and producing hard coating of Iron Nitride on the surface of steel
$R$. Tempering	$III$. Process of heating steel to redness and then cooling it suddenly by plunging it into water or oil
$S$. Quenching	$IV$. Process of heating quenched steel to a temperature well below redness and then cooling it slowly

Identify the reaction,which is not related to the extraction of copper.

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