The process of electrolysis of brine produces chlorine gas at which electrode?

During electrolysis, the anode is the positive electrode where oxidation occurs. Chloride ions lose electrons at the anode to form chlorine gas.

The reaction at the anode is: 2Cl⁻ → Cl₂ + 2e⁻. The chloride ions are oxidized by losing electrons, producing bubbles of chlorine gas.

At the cathode (negative electrode), water is reduced to form hydrogen gas and hydroxide ions. The anode and cathode terms refer to positive and negative electrodes.