Metals of medium reactivity are generally found in the form of which compounds?
Oxides, sulphides, or carbonates
Metals in the middle of the reactivity series, such as zinc, iron and lead, are moderately reactive.
In nature they occur mainly as oxides (e.g. haematite, Fe2O3), sulphides (e.g. zinc blende, ZnS; galena, PbS) or carbonates (e.g. calamine, ZnCO3).
Sulphide and carbonate ores are first converted into oxides by roasting or calcination, because it is easier to obtain a metal from its oxide.
Hence, the answer is oxides, sulphides, or carbonates.
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