[" Which of the following factors is of no significance for roasting sulphide ore to the oxide and "],[" thicting sulphide ore to carbon reduction drectly? "],[" 1."CO_(2)" is more volatill than "CS_(2)],[" 3.Metal sulphides are themodynamicly more stable than "cs_(2)],[" 3."CO_(2)" is thermodynamically more stable than "CS_(2)],[" 4.Metal sulphides are less stable than the corresponding oxides "]