The [tex]Br^{-}[/tex] describes the reducing agent in the reaction below.
[tex]Cl_{2} (aq) + 2Br^{-} (aq)[/tex] → [tex]2Cl^{-}(aq) + Br_{2}( aq)[/tex]
Reducing agent is the species in which oxidation is takes place. Reducing agent is the species in which loss of electrons is takes place. In the above reaction bromine ion in left hand side of the reaction loss electron to become bromine atom. So, bromine ion is reducing agent.
Oxidizing agent is the species in which reduction is takes place. Oxidizing agent is the species in which gain of electrons is takes place. In the above reaction chlorine atom in right hand side of the reaction gain electron to become chlorine ion. So, chlorine atom is reducing agent.
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