Concentrated sodium chloride solution is electrolyzed using mercury cathode and graphite anode. The products at the anode and the cathode respectively are
1:Identify the components involved in the electrolysis: The electrolysis involves a concentrated sodium chloride (NaCl) solution, a mercury cathode, and a graphite anode.
2: Determine the reactions at the electrodes: At the anode (oxidation), chlorine gas is produced because the potential for chlorine evolution is lower than that of oxygen evolution in a concentrated NaCl solution. The reaction is 2Cl^- → Cl2 + 2e^-.
3: Determine the reaction at the cathode: At the mercury cathode (reduction), sodium is produced and forms an amalgam with mercury because the potential for sodium reduction is lower than that of hydrogen evolution due to the high overpotential of hydrogen on mercury. The reaction is Na^+ + e^- → Na.
4: Identify the products: The products are chlorine gas (Cl2) at the anode and sodium (which forms an amalgam with mercury) at the cathode.
This implies Chlorine is produced at the anode and sodium at the cathode.
The correct answer is C.
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