Chlorine is the oxidizing agent while bromine is the reducing agent in the reaction Cl2 (g) + 2Br- (aq) → 2Cl- (aq) + Br2 (g).
A redox reaction is one in which there is loss or gain of electrons. The oxidizing agent gains electrons while the reducing agent loose electrons. Hence oxidation is electron loss while reduction is electron gain.
Given the reaction;
Cl2 (g) + 2Br- (aq) → 2Cl- (aq) + Br2 (g)
The oxidation half reaction is;
2Br- (aq) → Br2 (g)
The oxidation number of bromine was increased from -1 to zero
The reduction half reaction is;
Cl2 (g) → 2Cl- (aq)
The oxidation number of chlorine was reduced from zero to -1
Hence, chlorine is the oxidizing agent while bromine is the reducing agent.
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