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A. 2 Al+6 OH−→Al2O3+3 H2O+6 e−2 \mathrm{~Al}+6 \mathrm{~OH}^{-} \rightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+3 \mathrm{~H}_{2} \mathrm{O}+6 \mathrm{~e}^{-}2 Al+6 OH−→Al2O3+3 H2O+6 e−
B. Al2O3+3 H2O+6 e−→2 Al+6 OH−\mathrm{Al}_{2} \mathrm{O}_{3}+3 \mathrm{~H}_{2} \mathrm{O}+6 \mathrm{~e}^{-} \rightarrow 2 \mathrm{~Al}+6 \mathrm{~OH}^{-}Al2O3+3 H2O+6 e−→2 Al+6 OH−
C. HSO4−+3 H2O+8 e−→S2−+7 OH−\mathrm{HSO}_{4}^{-}+3 \mathrm{~H}_{2} \mathrm{O}+8 \mathrm{~e}^{-} \rightarrow \mathrm{S}^{2-}+7 \mathrm{~OH}^{-}HSO4−+3 H2O+8 e−→S2−+7 OH−
D. S2−+7 OH−→HSO4−+3 H2O+8 e−\mathrm{S}^{2-}+7 \mathrm{~OH}^{-} \rightarrow \mathrm{HSO}_{4}^{-}+3 \mathrm{~H}_{2} \mathrm{O}+8 \mathrm{~e}^{-}S2−+7 OH−→HSO4−+3 H2O+8 e−
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