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K(-): Fe²⁺ + 2e ---> Fe
A(+): 2Br⁻ ---> Br₂ + 2e
b) Ca(OH)₂ ---> Ca²⁺ + 2OH⁻
K(-): 2H₂O + 2e ---> H₂ + 2OH⁻
A(+): 4OH⁻ ---> O₂ + 2H₂O + 4e
c) HBr ---> H⁺ + Br⁻
K(-): 2H⁺ + 2e ---> H₂
A(+): 2Br⁻ ---> Br₂ + 2e