State wether the following are oxidation reaction and which is reduction reaction. $C u \to C u^{2 +} + 2 e^{-}$

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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,
$C u - 2 e^{-} \to C u^{+ 2}$
Cu looses two electrons and forms cupric ion so its a oxidation process.

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