Question

Which of the following chemical reactions represents Hall-Heroult Process?

• A. $Cr_2O_3 + 2Al → Al_2O_3 + 2Cr$
• B. $2Al_2O_3 + 3C → 4Al + 3CO_2$
• C. $FeO + CO → Fe + CO_2$
• D. $[2Au(CN)_2]-_{aq}+Zn(s)→ 2Au(s) + [Zn(CN_4)]^{2-}$

Answer 1

Answer: (B)

$2Al_2O_3 + 3C → 4Al + 3CO_2$

Answer 2

Hall-Herault process is used for the extraction of aluminium by electrolysis molten $Al_2O_3$

$2Al_2O_3 + 3C → 4Al + 3CO_2$