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Which gas is formed at the anode in the chlor-alkali process?

Answer and explanation

Correct answer: Chlorine

The chlor-alkali process is the electrolysis of concentrated aqueous sodium chloride, or brine. At the anode, chloride ions lose electrons: 2Cl⁻ → Cl₂ + 2e⁻, so chlorine gas is released there. At the cathode, water produces hydrogen gas, while sodium hydroxide remains in solution. Therefore option B is correct; hydrogen belongs at the cathode, not the anode.

Related tags

Chlor-AlkaliAnodeChlorineElectrolysisAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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