Classify the following unbalanced half-reactions as either an oxidation or a reduction.

${H_{2} O}_{2} (a q) ⟶ O_{2} (g)$

Oxidation

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Reduction

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Neither oxidation nor reduction

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None of these

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Solution

The correct option is B Oxidation
The unbalanced half reaction ${H_{2} O}_{2} (a q) ⟶ O_{2} (g)$ is oxidation.
The oxidation number of oxygen in $H_{2} O_{2}$ and $O_{2}$ is -1 and zero respectively.
Thus, there is an increase in the oxidation number which indicates oxidation.
Hence, the correct option is A.

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