A) Metal sulphides are less stable than the corresponding oxides.
B) \[C{{O}_{2}}\] is more volatile than\[C{{S}_{2}}\].
C) Metal sulphides are thermodynamically more stable than \[C{{S}_{2}}\].
D) \[C{{O}_{2}}\] is thermodynamically more stable than\[C{{S}_{2}}\].
Correct Answer: A
Solution :
\[2MS+C\xrightarrow{{}}2M+C{{S}_{2}};\,\,\,\,\Delta {{G}_{1}}=\] positive \[2MO+C\xrightarrow{{}}2M+C{{O}_{2}};\,\,\,\,\Delta {{G}_{2}}=\] negative This suggests that \[C{{O}_{2}}\] is thermodynamically more stable than \[C{{S}_{2}}\]. Metal sulphides are thermodynamically more stable than \[C{{S}_{2}}\]while metal sulphides are more stable than the corresponding oxides.
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