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(A) Molten $Al_2O_3 + Na_3AlF_6$ as electrolyte,carbon coated steel vessel cathode,and graphite anode are used to produce aluminium $(Al)$ by electrol

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Molten $Al_2O_3 + Na_3AlF_6$ electrolyte,carbon coated steel vessel cathode,graphite anode.

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(A) Molten $Al_2O_3 + Na_3AlF_6$ as electrolyte,carbon coated steel vessel cathode,and graphite anode are used to produce aluminium $(Al)$ by electrolysis. This process is known as the Hall-$H$éroult process. In this process,purified alumina is mixed with $Na_3AlF_6$ (cryolite),which lowers the melting point of the mixture and increases its electrical conductivity. In the electrolytic cell,the steel vessel acts as the cathode (coated with carbon),and graphite rods act as the anode. The overall reaction is $2Al_2O_3 + 3C \longrightarrow 4Al + 3CO_2 \uparrow$. The electrolytic reactions are as follows: $Al_2O_3 \longrightarrow 2Al^{3+} + 3O^{2-}$. At cathode: $Al^{3+} + 3e^{-} \longrightarrow Al_{(l)}$. At anode: $C_{(s)} + 2O^{2-} \longrightarrow CO_{2(g)} + 4e^{-}$. The oxygen liberated at the anode reacts with the carbon of the anode to produce $CO_2$. Hence,option $(A)$ is the correct answer.

Which one of the following is used to produce $Al$ by electrolysis?

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