Answer :

When Zinc Blende or Zinc Sulphide is strongly heated in air, it forms zinc oxide and sulphur di oxide. This process is called roasting.

2ZnS(s) + 3O2(g) -> 2ZnO(g) + 2SO2(g)

Then, zinc oxide is heatd with carbonto form zinc metal. This process is termed as reduction

Zn(s) + C(s) -> Zn(s) + CO(g)

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