Redox reaction — জারণ-বিজারণ বিক্রিয়া
A redox reaction is one where oxidation and reduction happen together — electrons pass from one species to another.
Definition
Redox is short for reduction–oxidation: a single reaction in which one species loses electrons (is oxidized) while another gains them (is reduced). Electrons never float free, so the number lost equals the number gained, and you can balance a redox equation by matching that flow. The electron donor is the reducing agent; the acceptor is the oxidizing agent. Combustion, rusting, displacement reactions, batteries, photosynthesis and respiration — most of chemistry's busy pages — all run on redox chemistry.
For example
In a zinc–copper cell, zinc gives up electrons (oxidation) while copper ions accept them (reduction) — the electron traffic that lights the bulb in your school electrochemistry experiment.