What is the name for the overall reaction where one species is oxidized and the other reduced?

• A. Redox Reaction
• B. Precipitation
• C. Acid-base Reaction
• D. Combustion

Answer: (A)

Redox reactions are all about electron transfer. In any redox process, one species loses electrons (oxidized) while another gains electrons (reduced); the two halves of the reaction are linked because the electrons released by the one species are exactly gained by the other. You can spot a redox change by tracking oxidation states: the oxidized species increases its oxidation number, the reduced species decreases. Often it helps to think in terms of two half-reactions—one showing oxidation and the other reduction—and then add them together so the electrons cancel, giving the overall reaction.

Other terms describe different processes: precipitation is solid formation from ions in solution, acid-base is proton transfer, and combustion is a rapid oxidation that releases heat and light—though combustion can involve redox chemistry, it is not the general name for the electron-transfer type of reaction.