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In the chlor-alkali process, which product is formed at the cathode during electrolysis of brine?

Answer and explanation

Correct answer: Hydrogen gas

The governing concept is electrolysis of concentrated aqueous sodium chloride, or brine. At the cathode, water is reduced more readily than sodium ions, producing hydrogen gas and hydroxide ions: 2H₂O + 2e⁻ → H₂ + 2OH⁻. Chlorine forms at the anode, while sodium hydroxide remains in solution. Therefore, option A is correct; sodium metal is not deposited from the aqueous solution.

Related tags

Chlor-Alkali ProcessCathodeHydrogenAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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