Metals at the top of the activity series are highly reactive and are never found in nature as free elements. Moderately reactive metals (Zn, Fe, Pb, etc.) are found mainly as oxides, sulphides, or carbonates in the earth’s crust.
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The most widely used method for refining impure metals is electrolytic refining, and this process is applied to metals like copper, zinc, tin, nickel, silver, and gold.
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