Compare roasting and calcination.

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Solution

Roasting:

1) this process is done in presence of excess of Oxygen.

2)This method is applied for sulphide ores.

3) Sulphur dioxide is produced along with metal oxide.

4)Example: $2 Z n S + 3 O_{2} ⟶ 2 Z n O + 2 S O_{2}$

Calcination:

1) this process is done in absence of Oxygen.

2) This method is applied to carbonate ores.

3) Carbon dioxide is produced along with metal oxide.

4) example: $Z n C O_{3} ⟶ Z n O + C O_{2}$

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