Tag: extraction of metals by electrolysis
Questions Related to extraction of metals by electrolysis
Identity the principle behind the concentration of bauxite ore.
Use the relationship $\Delta \,G^{\circ}\,=\,- nFE^{\circ} _{cell}$ to estimate the minimum voltage required to electrolyse $Al _2O _3$ in the Hall-Heroult process.
$\Delta G^{\circ} _{f}(Al _2O _3)\,=\,-1520\,kJ\,mol^{-1}$
$\Delta G^{\circ} _{f}(CO _2)\,=\,-394\,kJ\,mol^{-1}$
The oxidation of the graphite anode to $CO _2$ permits the electrolysis to occur at a lower voltage than if the electrolysis reactions were :
$Al _2O _3\,\rightarrow\,2Al\,+\,3O _2$.What is the approximate value of low voltage?
In electrtolysis of $Al _2O _3$ by Hall-Heroult process:
Which one of the following statements is incorrect?
A compound added to lower the fusion temperature of the electrolytic bath in the extraction of Al is ___________.
If $Zn/Zn^{+2}$ electrode is diluted 100 times then the change in electromotive force will be :-
The process of depositing thin layer of a metal over an another metal with a help of electric current is called :
Which pair of electrolytes could not be distinguished by the products of electrolysis using inert electrodes.
Calculate the half cell potential at $298$K for the reactoin ,Zn$^{+2}$ + $2$e$^{-}$ $\rightarrow$ Zn if [Zn$^{+2}$] =$2$M,
E$^{o}$$ _{Zn^{+2}/Zn}$ =-$0.76$V
E$^{o}$