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Where is hydrogen gas obtained in the chlor-alkali process?

Answer and explanation

Correct answer: At the cathode

During electrolysis of brine, water is reduced at the cathode, where reduction means gain of electrons. The cathode reaction may be written as 2H₂O + 2e⁻ → H₂ + 2OH⁻. Therefore hydrogen gas is collected at the cathode. Chlorine forms at the anode, while sodium hydroxide remains in the solution, so the other choices are incorrect.

Related tags

HydrogenCathodeBrine ElectrolysisAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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