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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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The `E^(ɵ)` of zinc `((Zn^(2+))/(Zn)=-0.76V)` or iron `((Fe^(2+))/(Fe)=-0.44V)` is less than that of copper `((Cu^(2+))/(Cu)=+0.34V)` and hence both zinc and iron can displace copper from solution of `Cu^(2+)` ions. Although zinc is a stronger reducing agent than iron, yet iron scrap is chiefly used in hydrometallurgy of copper because it is much cheaper than
Zinc.
`Fe+Cu^(2+)toFe^(2+)+Cu_(s)`
In contrast, to replace zinc from solution of `Zn^(2+)` ions, a more reactive metal than zinc is required, i.e., Al or Ca. But all these metals react with water
`(2H_2O+2e^(ɵ)toH_(2(g))+2overset(ɵ)(O)H_(aq):E^@-0.83V)`
Forming their corresponding ions with the evolutions of hydrogen gas. Although Al, Mg etc. Cannot be used to displace zinc from solution of `ZN^(2+)` ions. Thus, copper, can be extracted by hydrometallurgy but not zinc.
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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
    carnallite
    B
    dolomite
    C
    malachite
    D
    galena
  • Copper can be extracted from

    A
    Kupfernickel
    B
    Dolomite
    C
    Galena
    D
    Malachite
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    How many metals are commercially extracted by hydrometallurgy from the given metals : Ag, Mn, In, Cr,Pb,Au .

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

    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.