Molten sodium chloride is electrolysed using inert electrodes. What forms at each electrode?
Answer and explanation
Correct answer: B. Sodium metal at the cathode and chlorine gas at the anode
- Step 1: Molten NaCl contains only Na+ and Cl- ions.
- Step 2: Reduction at the cathode: Na+ + e- -> Na. Oxidation at the anode: 2Cl- -> Cl2 + 2e-.
Answer
sodium at the cathode, chlorine at the anode.
Why not the others: The first reverses the electrodes; hydrogen and oxygen need water, which a molten salt lacks.
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