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Hall- Heroult's process is given by :

1. Cu 2+ (aq) + H 2 (g) → Cu(s) + 2H + (aq)
2. Cr 2 O 3 + 2Al → Al 2 O 3 + 2Cr
3. 2Al 2 O 3 + 3C → 4Al + 3 CO 2
4. ZnO + C ⎯ ⎯ ⎯ ⎯ → ⎯ K 1673 Coke, Zn + CO

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

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