What do you mean by oxidation and reduction?

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Solution

Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.
Example: $Z n \to Z n^{+} + e^{-}$
The reduction is the gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.
Example: $C u^{2 +} + 2 e^{-} \to C u$

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