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Copper can be extracted by hydrometallur...

Copper can be extracted by hydrometallurgy but not zinc. Explain.

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Zinc is more electropositive `(E^@ = - 0.76V)` and therefore, is highly reactive metal. Hence it cannot be easily displaced from its solution of `ZnSO_4` . On the other hand , copper is less electropositive `(E^@ =+0.34V)` and can be readily displaced from its solution by some more active metal such as zinc.
`Zn(s) + Cu^(2+) (aq) to Zn^(2+) (aq) + Cu(s)`
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