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How is the gas formed at the cathode in the chlor-alkali process tested?

Answer and explanation

Correct answer: By a pop sound near a burning splint

In the chlor-alkali process, concentrated brine is electrolysed. At the cathode, water is reduced and hydrogen gas is released: 2H₂O + 2e⁻ → H₂ + 2OH⁻. Hydrogen is combustible, so bringing a burning splint or flame close to the collected gas produces the characteristic ‘pop’ sound. Hence option B is correct. Lime water is a test for carbon dioxide, turmeric indicates a base under suitable conditions, and blue litmus turning red indicates acidity; none identifies hydrogen.

Related tags

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

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