The correct statement regarding the given Ellingham diagram is :

  • Option 1)

    At 500^{0}C , coke can be used for the extraction of Zn from ZnO 

  • Option 2)

    At  1400^{0}C , Al can be used for the extraction of Zn from ZnO

  • Option 3)

    At 800^{0}C , Cu can be used for the extraction of Zn from ZnO.

  • Option 4)

    Coke cannot be used for the extraction of Cu from Cu_{2}O .

Answers (1)
A admin

 

Ellingham Diagram -

Ellingham diaghram normally consists of plots of \bigtriangleup fG^{\circ} Vs T for the formation of oxides of elements.

- wherein

2xM(s)+O2(g)\rightarrow 2MxO(s)

 

 

Reduction of Metal Oxide to Metal -

The crude metal is obtained when the roasted ore or calcined ore is put to reduction by using a suitable reducing agent.

- wherein

HgO+HgS\rightarrow 3Hg+SO2

 

 

Smelting or Reduction with Carbon -

This involves reduction of ore to the molten metal at a high temperature.

Roasted or calcined ore is mixed with suitable quantity of coke or charcoal which act as reducing agent and is heated to high temperature above its melting point.

- wherein

For extraction of less electropositive metals such as Pb, Zn, Fe,Sn etc by powerful reducing agents such as C, H2, CO, Watergas,Na,K,Mg, Al may be used.

MxOy +yC \rightarrow xM +yCO

From the diagram, Al can reduce ZnO to Zn 

3ZnO+2Al\rightarrow zn+Al_{2}O_{3}

 


Option 1)

At 500^{0}C , coke can be used for the extraction of Zn from ZnO 

Option 2)

At  1400^{0}C , Al can be used for the extraction of Zn from ZnO

Option 3)

At 800^{0}C , Cu can be used for the extraction of Zn from ZnO.

Option 4)

Coke cannot be used for the extraction of Cu from Cu_{2}O .

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