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

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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,
cupric ion gets two electrons and forms copper so its a reduction reaction.

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