Answer:
(i) \[O_{2}^{2-}+2{{H}_{2}}O\to
2O{{H}^{-}}+{{H}_{2}}{{O}_{2}}\]
(ii) \[2O_{2}^{-}+2{{H}_{2}}O\to
2O{{H}^{-}}+{{H}_{2}}{{O}_{2}}+{{O}_{2}}\]
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