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Definition of Redox reaction

Redox reaction Definition from Science & Technology Dictionaries & Glossaries
Electrochemistry Dictionary
"A class of electrode reactions involving oxidation/reduction of two dissolved species. E.g., iron metal can exist in solution as a doubly positively charged (""ferrous"") ion or a triply positively charged (""ferric"") ion. Such a system is often called a ""redox couple,"" such as the ""ferrous/ferric"" couple. The ferric ions can be cathodically reduced to ferrous ions, or the ferrous ions can be anodically oxidized to ferric ions. With these reactions, an inert electrode is used that does not take part in any reactions under the conditions of the oxidation/reduction of the ions. This electrode then acts only as a source or sink of electrons; examples are: carbon, graphite, platinum, gold. Compare with a metal deposition/dissolution reaction where one of the reacting species is a solid metal and the other species is in solution. "
General Chemistry Glossary
A reaction that involves transfer of electrons from one substance to another. Redox reactions always involve a change in oxidation number for at least two elements in the reactants.
Redox reaction Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Redox (reduction-oxidation) reactions include all chemical reactions in which atoms have their oxidation state changed; in general, redox reactions involve the transfer of electrons between species.

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