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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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In the electrolysis of brine in the chlor-alkali process, what is the correct order of gases formed at anode and cathode?

Answer and explanation

Correct answer: Chlorine at anode, hydrogen at cathode

The chlor-alkali process is the electrolysis of concentrated aqueous sodium chloride, or brine. At the anode, chloride ions lose electrons and form chlorine gas: 2Cl⁻ → Cl₂ + 2e⁻. At the cathode, water gains electrons and produces hydrogen gas. Sodium hydroxide remains in solution. Thus option B gives the correct anode-to-cathode order; the other options reverse or name products that are not formed in this process.

Related tags

Chlor-AlkaliBrineElectrolysisAnodeCathodeAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour
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10 more MCQs
  1. 1What type of substance turns blue litmus paper red?
  2. 2What type of substance turns red litmus paper blue?
  3. 3Which of the following substances acts as a natural indicator?
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  6. 6What is the nature of a solution whose pH is less than 7?
  7. 7At 25°C, a solution with a pH greater than 7 is of which nature?
  8. 8A student dips red litmus paper into a soap solution. What change will occur in the red litmus paper?
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