In Down's cell cathode is made up of:
Correct answer: C. Iron
- A. Graphite
- B. Copper
- C. Iron
- D. Inert material
Explanation
In Down's cell, which is employed for the electrolytic production of sodium metal, the cathode is constructed from iron. This choice is due to iron's ability to provide a stable surface for the reduction of sodium ions (Na⁺) to sodium metal (Na). The anode in this setup is made of graphite, which facilitates the oxidation of chloride ions to chlorine gas. Graphite, copper, and generalized inert materials are not suitable for the cathode in this specific electrochemical process, as they do not support the reduction reactions required for sodium production.
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