A metal M occurs as a sulphide ore concentrated by froth flotation. The ore is roasted, the oxide is heated with coke near $1673\mathrm{K}$ and M leaves the furnace as vapour (boiling point $1180\mathrm{K}$). The metal also precipitates gold from $\mathrm{Na}[\mathrm{Au}(\mathrm{CN}){}_2]$ solution. Roasting $48.5\mathrm{g}$ of the pure sulphide (M = 65, S = 32) at STP gives what volume of $\mathrm{SO}{}_2$, and what mass of M is obtained on complete reduction of the oxide?

1. A$22.4\mathrm{L}$ of $\mathrm{SO}{}_2$ and $32.5\mathrm{g}$ of Zn
2. B$11.2\mathrm{L}$ of $\mathrm{SO}{}_2$ and $65\mathrm{g}$ of Zn
3. C$11.2\mathrm{L}$ of $\mathrm{SO}{}_2$ and $32.5\mathrm{g}$ of Zn
4. D$16.8\mathrm{L}$ of $\mathrm{SO}{}_2$ and $16.25\mathrm{g}$ of Zn