State as oxidation or reduction in the given reaction: $O + 2 e^{-} \to O^{2 -}$

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Solution

Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion. Reduction is the gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.
Here,
$O + 2 e^{-} \to O^{2 -}$ in this reaction, oxygen atom is getting two electron and form an anion so its a reduction process.

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