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.

List-$I$	List-$II$
$(I)$ Calcination	$a. Fe_2O_3 \cdot nH_2O \rightarrow Fe_2O_3 + nH_2O$
$(II)$ Roasting	$b. 2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2$
$(III)$ Flux	$c. SiO_2 + FeO \rightarrow FeSiO_3$
$(IV)$ Thermite	$d. Cr_2O_3 + 2Al \rightarrow Al_2O_3 + 2Cr$

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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$2CuFeS_2 + O_2 \rightarrow Cu_2S + 2FeS + SO_2$
Which process of metallurgy of copper is represented by the above equation?

Heating of pyrites in air for oxidation of sulphur is called

Which of the following sulphides,when heated strongly in air,gives the corresponding metal?

Match the following:

List-$I$ List-$II$

$(I)$ Calcination $a. Fe_2O_3 \cdot nH_2O \rightarrow Fe_2O_3 + nH_2O$

$(II)$ Roasting $b. 2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2$

$(III)$ Flux $c. SiO_2 + FeO \rightarrow FeSiO_3$

$(IV)$ Thermite $d. Cr_2O_3 + 2Al \rightarrow Al_2O_3 + 2Cr$

Among the following,the calcination process is

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