Question

Differentiate between calcinations and rosting. how can you obtain pure metal from their oxides?​

Answer 1

Roasting :

• Ore is heated in excess of air

• This is used for sulphide ores

• SO2 is produced along with metal oxide

Calcination :

• Ore is heated in the absence of Limited supply of air

• this is used for carbonate ores

• CO2 is produced along with metal oxide

Answer 2

Calcination: -

1. It is done for carbonate ores.

2. Heating of carbonate ore in absence of oxygen.

3. CO2 is released and metal oxide is obtained.

4. It shows substitution reaction.


Roasting:-

1. It is done for sulphide ore.

2. Heating of sulphide ore in presence of Oxygen.

3. SO2 gas is released and metal oxide is obtained.

4. It shows Decomposition reaction.


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