Which of the following statements about the advantage of roasting of sulphide ore before reduction is not true?

1. Carbon and hydrogen act as suitable reducing agents for metal sulphides

2. The ${∆}_f{G}^0$ of the sulphide is greater than those for $C{S}_2$ and $H_{2}S$

3. The ${∆}_f{G}^0$ is negative for roasting of sulphur ore to oxide.

4. Roasting of the sulphide to the oxide is thermodynamically feasible