Question

The role of coke in the electrolytic reduction of alumina is to _______.
a.) provide heat for melting of alumina
b.) prevent loss of heat
c.) prevent burning of carbon rods
d.) reduce alumina to metal

Answer 1

Hint: Electrolytic reduction is characterized as the electrolysis cycle which is used to remove metals from liquid chloride or oxides, the particles of the metals get gathered at cathode and the particles of oxygen and chlorine at anode.

Complete step by step answer:
In extraction of aluminum following response happens:
$2A{l_2}{O_3} \to 4Al + 3{O_2}$
Oxygen is emitted at the positive carbon anode. Carbon dioxide is likewise radiated at the anode in light of the fact that hot oxygen responds with the carbon anode to shape carbon dioxide gas.
$C + {O_2} \to C{O_2}$
The carbon anodes gradually vanish in light of the fact that every atom of carbon dioxide which is emitted takes a little bit of carbon away with it.
The correct answer is option “C” .

Additional Information :
- What is the electrolytic reduction method?
Ans: The electrolytic reduction is a kind of electrolysis where electric flow goes through an ionic substance (liquid or broken down ) delivering synthetic response at the terminals and a deterioration of the materials. The oxides, hydroxides and chlorides of metals in a melded state are electrically reduced by utilizing this technique. The metals are separated at cathode.

Note: The kind of extraction method to be utilized for the extraction of the metals from their ores depends upon the minerals relies on its situation in the reactivity arrangement. Metal that lies underneath the carbon in the reactivity arrangement can be removed from their separate oxides by warming them with carbon. However, for the metals that lie above carbon, their individual oxides can't be diminished by warming it with carbon oxide.