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Which gas is formed at the cathode in the chlor-alkali process and how is it identified?

Answer and explanation

Correct answer: Hydrogen and pop sound

In the chlor-alkali process, concentrated aqueous sodium chloride is electrolysed. Water is reduced at the cathode, producing hydrogen gas and hydroxide ions: 2H2O + 2e− → H2 + 2OH−. Hydrogen burns rapidly with a characteristic ‘pop’ when a burning splint is brought near it. Therefore option A is correct; chlorine is produced at the anode, not the cathode.

Related tags

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

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