Select the process in which SO_2 is NOT evolv | vedclass

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(D) In the roasting of $Cu_2S$,the reaction is $2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2$,which evolves $SO_2$.In the self-reduction process,$2Cu_2O +

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When partially roasted $FeS$ is heated with Silica

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(D) In the roasting of $Cu_2S$,the reaction is $2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2$,which evolves $SO_2$.In the self-reduction process,$2Cu_2O + Cu_2S \rightarrow 6Cu + SO_2$,which also evolves $SO_2$.In the partial roasting of $FeS$,the reaction is $2FeS + 3O_2 \rightarrow 2FeO + 2SO_2$,which evolves $SO_2$.When partially roasted $FeS$ (containing $FeO$) is heated with silica $(SiO_2)$,the reaction is $FeO + SiO_2 \rightarrow FeSiO_3$ (slag formation). In this specific step,no $SO_2$ is evolved.

Select the process in which $SO_2$ is $NOT$ evolved:

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