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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 then that of `Cu^(2+)//Cu=+0.34V`. This means that zinc is a stronger reducing agent than copper. In solution `Cu^(2+)` ions can be easily displaced by reducing agents like Fe and Zn which donot react with water.
`Fe(s)+Cu^(2+) (aq) to Fe^(2+) (Aq)+Cu(s)`
In order to isolate zinc by hydrometallurgy, we require stronger reducing agents like Ca, Mg , Al etc. However, all of them react with water to evolve hydrogen gas. Therefore, these cannot be used for the purpose. Thus, zinc cannot be extracted by hydrometallurgy.
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How many metals are commercially extracted by hydrometallurgy from the given metals : Ag, Mn, In, Cr,Pb,Au .

Knowledge Check

  • Copper can be extracted by hydrometallurgy but not zinc because

    A
    Copper is comparatively less active metal as its reduction potential is high. It can be displaced from solutions of `Cu^(2+)` ion by more active metals
    B
    `Zn` displaced from solution of `Zn^(2+)` ion, a more reactive metal than it, but then readily reacts with water forming their corresponding ions and evolve hydrogen gas
    C
    Both (a) and (b) are correct
    D
    Copper can never be extracted by hydrometallurgy

  • Copper can be extracted from

    A
    Kupfernickel
    B
    Dolomite
    C
    Galena
    D
    Malachite

  • Copper can be extracted from

    A
    carnallite
    B
    dolomite
    C
    malachite
    D
    galena

    • Similar Questions

    Explore conceptually related problems

    (a) How can copper be extracted from hydrometallurgical process ?

    What is hydrometallurgy? Explain with an example.

    Copper is extracted by hydrometallurgy from low grade ores. Which of the following reaction is/are involvedgt

    Assertion: Extraction of zinc from sphalerite ore involes the roasting followed by reduction with coke. Reason: Zinc can be extracted by hydrometallurgy.

    Assertion : Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. Reason : Copper is extracted by hydrometallurgy.

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