'A' + H2O NaOH; 'A' B NaOH + O2<br>B is used for oxygenating in submarine. A and B are : — s Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: On a large scale, sodium hydroxide (caustic soda) is manufactured by the electrolysis of an aqueous solution of sodium chloride (brine) in a Castner-Kellner cell or membrane cell. Step 2: At the anode, chloride ions are oxidized to chlorine gas (2Cl- -> Cl2 + 2e-). At the cathode, water is reduced to hydrogen gas and hydroxide ions (2H2O + 2e- -> H2 + 2OH-), leaving sodium hydroxide in the solution. Step 3: This process is the electrolytic chlor-alkali process, corresponding to option (b).