RCL-LELUI
221. Which of the following ions is discharged at the
cathode when an aqueous solution of sodium *
hydroxide is electrolysed ?
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During electrolysis of aqueous sodium hydroxide solution, hydrogen is liberated at cathode in preference to sodium. This is because H+ ions have higher reduction potential (or lower discharge potential) than Na+ ions. However when fused sodium hydroxide is used for the electrolysis, sodium is discharged at cathode.
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