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NEET2006ChemistryElectrochemistryActual

The products formed when an aqueous solution of NaBr is electrolysed in a cell having inert electrodes are

Options

  1. ANa and Br ₂
  2. BNa and O ₂
  3. CH ₂, Br ₂ and NaOH
  4. DH ₂ and O ₂ .

Correct answer

C. H ₂, Br ₂ and NaOH

Step-by-step solution

: NaBr Na ⁺+ Br ⁻ H ₂ O H ⁺+ OH ⁻ At cathode : 2 H ⁺+2 e⁻ H ₂ At anode : 2 Br ⁻-2 e⁻ Br ₂ In solution : Na ⁺+ OH ⁻ NaOH As discharge potential of H ⁺ ions is lower than that of Na ⁺ ions and discharge potential of Br ⁻ ions is lower than that of OH ⁻ ions, H ₂ is liberated at cathode and Br ₂ is liberated at anode.

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