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Redox Reaction

State whether...

Question

State whether the following conversions are oxidation or reduction reactions.
$C u^{2}^{+} + 2 e^{-} \to C u$

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Solution

Reduction: A process in which the oxidation state of an atom or ion decreases by gaining electrons.

In the given reaction, oxidation state of copper decreases from +2 to 0. So, copper gets reduced.

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2 C l^{-} \to C l_{2} + 2 e^{-}

C u \to C u^{2 +} + 2 e^{-}

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The oxidation and reduction half reactions of the reaction

2Al_(s) + 3Cu²⁺_(aq) → 2Al³⁺_(aq) + 3Cu_(s) are

Z n | Z n^{2 +} (a q) (1.0 M) | | C u^{2 +} (a q) (1.0 M) | C u

+ 0.35 V

2 e^{-} + C u^{2 +} (a q) \to C u^{2 +} (a q) (1.0 M) | C u

+ 0.35 V

2 e^{-} + C u^{2 +} (a q) \to C u

- 0.763 V

2 e^{-} + Z n^{2 +} (a q) \to Z n

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