Which of the following factors is of text{no | vedclass

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(D) The reduction of metal sulphides by carbon is generally not spontaneous because the $\Delta G$ value for the reaction $MS + C \rightarrow M + CS_2

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$CO_2$ is more volatile than $CS_2$

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(D) The reduction of metal sulphides by carbon is generally not spontaneous because the $\Delta G$ value for the reaction $MS + C \rightarrow M + CS_2$ is positive.In contrast,the reduction of metal oxides by carbon is spontaneous because the $\Delta G$ value for $MO + C \rightarrow M + CO_2$ is negative.This difference arises because $CO_2$ is thermodynamically much more stable than $CS_2$.Therefore,the stability of the metal sulphide compared to the oxide and the relative stability of $CO_2$ versus $CS_2$ are significant factors.The volatility of $CO_2$ compared to $CS_2$ is not a thermodynamic factor that determines the feasibility of the reduction process.

Which of the following factors is of $\text{no significance}$ for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

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