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

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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, Na atom is loosing one electron and forms cation so its a oxidation process.

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