Post-UTME Chemistry 2005 Objective — Question 27
Question 27 of 27 from the Post-UTME Screening (Post-UTME) Chemistry 2005 Objective paper, with the correct answer and a full explanation.
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The preferential discharge of sodium during the electrolysis of brine using mercury as cathode is due to one of the following
- A. High concentration of Na
- B. Na is lower than H in the electrochemical series
- C. Discharge of sodium as the amalgam requires less energyCorrect
- D. Concentration of H+ is higher
Explanation
Mercury forms a sodium amalgam, which significantly lowers the energy required to discharge sodium at the cathode compared to hydrogen.
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