Question

Carbonate and sulphide ores are usually converted into oxides during the process of extraction. Why?

Answer 1

Hey...
Carbonates and sulphide ore are usually converted into oxides during the process of extraction because it is easy to extract metal from its oxide ore by reduction reaction when compared to carbonate or sulphide ore.
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@ Saadya

Answer 2

Obtaining a metal from its oxide is much easier than doing that from a metal sulphide and carbonate. Due to this metal sulphides and carbonates are first converted to metal oxides during metallurgy.