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K(-): 2H₂O + 2e ---> H₂ + 2OH⁻
A(+): 2H₂O ---> O₂ + 4H⁺ + 4e
b) Pb(NO₃)₂ ---> Pb²⁺ + 2NO₃⁻
K(-): Pb²⁺ + 2e ---> Pb
A(+): 2H₂O ---> O₂ + 4H⁺ + 4e
c) HBr ---> H⁺ + Br⁻
K(-): 2H⁺ + 2e ---> H₂
A(+): 2Br⁻ ---> Br₂ + 2e
d) H₃PO₄ ---> 3H⁺ + PO₄³⁻
K(-): 2H⁺ + 2e ---> H₂
A(+): 2H₂O ---> O₂ + 4H⁺ + 4e