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What is the correct order of gases formed at the anode and cathode in the chlor-alkali process?

Answer and explanation

Correct answer: Chlorine at anode and hydrogen at cathode

The chlor-alkali process is the electrolysis of concentrated aqueous sodium chloride, or brine. At the anode, chloride ions lose electrons and form chlorine gas: 2Cl⁻ → Cl₂ + 2e⁻. At the cathode, water gains electrons and produces hydrogen gas and hydroxide ions. Sodium hydroxide remains in the solution. Therefore, chlorine is formed at the anode and hydrogen at the cathode, making option A correct; the other choices reverse or misidentify the products.

Related tags

Chlor-AlkaliElectrolysisBrineAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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