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An atom cannot receive an electron (be reduced) without another atom giving up an electron (be oxidized). In other words, it's impossible to have just a reduction because another atom needs to first give the electron up.

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13y ago
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13y ago

The single elements in the reactants will have oxidation numbers of 0. Once they are in a compound, they will have different oxidation numbers.

Not all combination reactions are redox reactions. If all the reactants are compounds, then they will not be redox reactions. For example:

CaO + SO2 --> CaSO3

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Q: Why must all combination reactions also be redox reactions?
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