O2(g) + 4e- --> 2O2- (aq)
Explanation =
Formula of dioxygen = O2
Formula of oxide ion= O 2-
1. First balancing oxygen atoms =
O2(g) - -> 2O2- (aq)
2. Balancing charge =
O2(g) + 4e- --> 2O2- (aq)
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