Answer the following question:
In zinc metallurgy, provide the balanced reactions involved during:
i. Roasting of sulphide ores
ii. Calcination of carbonate ores
i. Roasting of sulphide ores
ii. Calcination of carbonate ores
i. The reaction involved during the extraction of zinc from its ore by roasting of zinc ore is
ii. The reaction involved during the extraction of zinc from its ore by calcination of zinc ore is