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Redox reactions do not always include oxygen. For example, look at #13 from Chapter 14 in the 6th Edition. Not one of the cell reactions for the galvanic cells given, all of which are redox reactions, include oxygen.
Redox reactions do not always involve oxygen. Redox reactions always involve the reduction and oxidation of some compound. So one compound loses electrons and another compound gains these lost electrons. Whether Oxygen is present or not has nothing to do with a redox reaction.
Since a redox reaction is a reduction/oxidation reaction, I thought oxygen had to be present but when I searched it up it says that "Oxygen does not have to be present in a reaction for it to be a redox-reaction. Oxidation is the loss of electrons." https://simple.wikipedia.org/wiki/Oxidation
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