05-03-2017
Chemistry

contestada

Which of the following are oxidation half-reactions?

Cr2O72- → Cr3+

MnO4- → MnO2

Fe2+ → Fe3+

Cl- → Cl2

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sdmatera sdmatera

05-03-2017

The answer is the third choice because is oxidation half reactions, only the oxidation state of the reducing agent changes; in this third choice, Fe2+ is oxidized and becomes Fe3+. Just keep in mind that half reactions usually include the change in electrons:

Fe2+ -> Fe3+ +e-

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