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Why is it advantageous to roast a sulphi...

Why is it advantageous to roast a sulphide ore before reduction?

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The standard free energies .(triangle G^circ). of formation of most of the sulpliides are greater than those of .CS_2. and .H_2 ~S cdot(CS_2.. is, infáct, .an., endothermic compound). Therefore, neither. C nor .H_2. can reduce sulphides to their oxides. In contrast, the standard free energies of formation of oxides -are much lower than those of .SO_2. and hence oxidation of .metal sulphides to metal oxides is thermodynamically favourable.
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Which of the following statements, about the advantage of roasting of sulphide ore before reduction, is not trué? roasting of the sulphide to the oxide is thermodynamically feasible, carbon and hydrogen are suitable reducing agents for metal sulphides, The Delta_f G^o of the sulphide is greater than thóse for CS_2 and H_2 S , The Delta_f G^o is negative for roasting of sulphide ore to oxide.

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

Which metals have sulphide ores?

Why is reduction of a metal oxide easier if the metal formed is in liquid state at the temperature adopted for reduction?

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