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Which gas is formed at the cathode in the chlor alkali process?

Answer and explanation

Correct answer: Hydrogen

In the chlor-alkali process, brine (aqueous sodium chloride solution) is electrolysed. At the cathode, water is reduced to form hydrogen gas: \(2H_2O + 2e^- \rightarrow H_2 + 2OH^-\). Chlorine is produced at the anode, so option B is incorrect. Exam tip: reduction always takes place at the cathode during electrolysis.

Related tags

Class 10 ScienceAcids Bases SaltsChlor-Alkali ProcessElectrolysisCathode ReactionHydrogen Gas

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