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Platinum electrode is an example of an inert electrode.
Copper electrode is an example of an active electrode.
Bromide ions, Br⁻, are attracted to the anode during electrolysis.
Lead ions, Pb²⁺, are attracted to the cathode during electrolysis.
O²⁻ + 4e⁻ → O₂ is a half-equation for oxidation.
Pb²⁺ + 2e⁻ → Pb is a half-equation for oxidation.
2Br⁻ → Br₂ + 2e⁻ is a half-equation for oxidation.
Na⁺ + e⁻ → Na is a half-equation for oxidation.
Electrolysis of sodium sulfate solution produces hydrogen gas at the cathode.
Chlorine gas is produced at the cathode during the electrolysis of sodium chloride solution.