Question

The ores of A and B were taken. On heating ore A gives Co2 where as ore B gives SO2. What steps will you take to convert them into metals?

Answer 1

After heating we will proceed with reduction process. It will mainly be done with carbon. But sometimes aluminum powder is also used. Further it will go for refining.

Answer 2

When carbonate ore (ore A) is heated, it produces carbon dioxide. A carbonate ore undergoes

calcination to give metal oxide. For example, zinc carbonate undergoes calcination to give zinc oxide.

ZnCO3 → ZnO + CO2

When a sulphide ore (ore B) is heated, it produces sulphur dioxide. A sulphide ore undergoes roasting to

give metal oxide. For example, zinc sulphide undergoes roasting to give zinc oxide.

2ZnS + 3O2→ 2ZnO + 2SO2

After calcinations or roasting, zinc oxide should be reduced to obtain zinc. ZnO is a white powdery

substance and is insoluble in water.

2ZnO + C → 2Zn + CO2