What is the reducing agent in this reaction? Cl sub 2 times A q plus 2 Br raised to the negative A q power rightarrow 2 Cl raised to the negative A q power plus Br sub 2 times A q

A reducing agent donates electrons and is oxidized. In this reaction, bromide ions (Br⁻) become Br₂, so they lose electrons; those electrons reduce Cl₂ to Cl⁻. Therefore, the reducing agent is Br⁻, choice B.

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