The product, which is not obtained during the electrolysis of brine solution is

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Strategy:
 The electrolysis of brine (concentrated aqueous ) involves competing reactions at the electrodes. Analyze the discharge potential of available ions to determine the net products in the solution.

Step 1: Analyze electrode reactions
- At Cathode: Preference is given to the reduction of water over  because  is higher.
  
  Product: Hydrogen gas.
  
- At Anode: Due to overvoltage,  is oxidised in preference to water.
  
  Product: Chlorine gas.

Step 2: Determine solution components
The

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