A. 2 H2O(ℓ)→H2(g)+2 OH−(aq)+2 e−2 \mathrm{~H}_{2} \mathrm{O}(\ell) \rightarrow \mathrm{H}_{2}(\mathrm{g})+2 \mathrm{~OH}^{-}(\mathrm{aq})+2 \mathrm{~e}^{-}2 H2O(ℓ)→H2(g)+2 OH−(aq)+2 e−
B. 2 H2O(ℓ)+2 e−→H2(g)+2 OH−(aq)2 \mathrm{~H}_{2} \mathrm{O}(\ell)+2 \mathrm{~e}^{-} \rightarrow \mathrm{H}_{2}(\mathrm{g})+2 \mathrm{~OH}^{-}(\mathrm{aq})2 H2O(ℓ)+2 e−→H2(g)+2 OH−(aq)
C. 2 H2O(ℓ)→O2(g)+4 H+(aq)+4 e−2 \mathrm{~H}_{2} \mathrm{O}(\ell) \rightarrow \mathrm{O}_{2}(\mathrm{g})+4 \mathrm{~H}^{+}(\mathrm{aq})+4 \mathrm{~e}^{-}2 H2O(ℓ)→O2(g)+4 H+(aq)+4 e−
D. 2 H2O(ℓ)+4 e−→O2(g)+4 H+(aq)2 \mathrm{~H}_{2} \mathrm{O}(\ell)+4 \mathrm{~e}^{-} \rightarrow \mathrm{O}_{2}(\mathrm{g})+4 \mathrm{~H}^{+}(\mathrm{aq})2 H2O(ℓ)+4 e−→O2(g)+4 H+(aq)
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