A) \[C{{O}_{2}}\]is more volatile than \[C{{S}_{2}}\].
B) Metal sulphides are thermo dynamically more stable than \[C{{S}_{2}}\].
C) \[C{{O}_{2}}\] is thermodynamically more stable than \[C{{S}_{2}}\].
D) Metal sulphides are less stable than the corresponding oxides.
Correct Answer: A
Solution :
[a] : Oxidising roasting is a very common type of roasting in metallurgy and is carried out to remove sulphur and arsenic in the form of their volatile oxides. \[C{{S}_{2}}\]is more volatile than \[C{{O}_{2}}\]. So, option [a] is of no significance for roasting sulphide ores to their oxides. The reduction process is on the thermodynamic stability of the products and not on their volatility.
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