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1. AlCl3
AL = +3
Cl = -1
2. Fe2O3
Fe = +3
O = -2
₊₄ ₋₂
3. SO2
S = +4
O = -2
₊₂ ₋₂
4. C O
C = +2
O = -2
5. ---
₋₄ ₊₁
6. C H4
C = -4
H = +1