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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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Q. Consider the cell,

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

The standard reduction potentials are

+ 0.35 V

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- 0.763 V

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Calculate the emf of the cell and tell whether the cell reaction spontaneous or not ?

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