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Question
Identify the following pair of species is in its oxidized state?
\[\ce{O2/O^2-}\]
Solution
\[\ce{O2/O^2-}\]
Here, each O gains two electrons to form \[\ce{O^2-}\] ion.
\[\ce{O2_{(g)} + 2e- ->2O^2-_{ (aq)}}\]
Hence, \[\ce{O2/O^2-}\] is in a reduced state.
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