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In electrolysis of brine, which product is formed at the anode and what is one use of it?

Answer and explanation

Correct answer: Chlorine and water purification

The governing process is the chlor-alkali process, in which concentrated aqueous sodium chloride (brine) is electrolysed. Chloride ions move to the anode and are oxidised: 2Cl⁻ → Cl₂ + 2e⁻. Thus chlorine gas is formed at the anode and is used for disinfecting or purifying water, making option B correct. Hydrogen is produced at the cathode, not the anode; sodium metal is not deposited from aqueous brine, and carbon dioxide is unrelated.

Related tags

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

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