Question

2 ores a and b were taken . On heating ore a it gives co2 whereas ore b gives so2 .What step will to take to convert them into metal .

Answer 1

Ore A : Smelting
Ore B : Roasting

Answer 2

Explanation:

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