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

1. Cr 2 O 3 + 2Al → Al 2 O 3 + 2Cr
2. 2Al 2 O 3 + 3C → 4Al + 3CO 2
3. FeO + CO → Fe + CO 2
4. [ 2Au(CN) 2 ] – (aq) + Zn(S) → 2Au(s) + [Zn(CN 4 )] 2–

Correct answer: 2Al 2 O 3 + 3C → 4Al + 3CO 2

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