Chemistry - Metallurgy Question with Solution | TestHub

1. PbS → PbO is carried out by Roasting (P) because sulfide ores are heated in excess air to form oxide.

2. CaCO₃ → CaO is an example of Calcination (Q) where carbonate ore is heated in limited or no air.

3. ZnS → Zn involves Roasting and Carbon reduction (P, R) since ZnS is first converted into ZnO and then reduced by carbon.

4. Cu₂S → Cu involves Roasting and Self-reduction (P, S) where part of sulfide converts into oxide and then reacts with remaining sulfide to give copper.