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Copper can be extracted by hydrometallur...

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

Text Solution

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`E_(@)` Value of `Zn^(2+)//Zn=0`. 76V is less than that of Cu, means that zinc is a stronger reducing agent and can easily displace the ions present in the complex.
`[Cu(CN)_(2)]+Znrarr[Zn(CN)_(2)]+Cu`
`underset(("Soluble complex"))([Cu(CN)_(2)])+Znrarr[Zn(CN)_(2)]+underset((ppt.))(Cu)`
So, size can be isolated by hydrometallurgy only when stronger reducing agents than zinc (Ca, Mg, Al, etc.) are present. But these react with water to evolve hydrogen gas. Thus, these metals also do not solve the purpose and zinc cannot be extracted by hydrometallurgy.
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