Two ore A and B were taken. on heating, ore A gives co2 wherear, ore B gives so2. What steps will you take to convert them into metals?
Answers
For Ore A we will first perform Calcination(Since it is a carbonate), which will give us an oxide which can be then reduced using coke(carbon) and heating it and hence we'll obtain the metal.
For Ore B we will first perform Roasting(Since it is a sulphate), which will again give us an oxide and hence follow the same procedure as the first one.
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