Complete the following reactions:
$(i) \ O_2^{2-} + H_2O \to $
$(ii) \ O_2^- + H_2O \to $

$O_2^{2-}$ is the peroxide ion.
$O_2^-$ is the superoxide ion.
$(i)$ Peroxide ion reacts with water to form hydrogen peroxide $(H_2O_2)$ and hydroxide ions $(OH^-)$:
$O_2^{2-} + 2H_2O \to 2OH^- + H_2O_2$
$(ii)$ Superoxide ion reacts with water to produce hydrogen peroxide $(H_2O_2)$,oxygen $(O_2)$,and hydroxide ions $(OH^-)$:
$2O_2^- + 2H_2O \to 2OH^- + H_2O_2 + O_2$