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प्रश्न
Starting with sodium chloride how would you proceed to prepare sodium metal.
उत्तर
Sodium can be extracted from sodium chloride by Downs process.
This process involves the electrolysis of fused NaCl (40%) and CaCl2 (60 %) at a temperature of 1123 K in Downs cell.
Steel is the cathode and a block of graphite acts as the anode. Metallic Na and Ca are formed at cathode. Molten sodium is taken out of the cell and collected over kerosene.
\[\ce{NaCl ->[Electrolysis] Na+ + Cl-}\]
Molten
At Cathode : \[\ce{Na^+ + e^- -> Na}\]
At Anode : \[\ce{Cl- + e- -> Cl}\]
\[\ce{Cl + Cl -> Cl_2}\]
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संबंधित प्रश्न
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| Column I | Column II |
| (i) Cs | (a) Apple green |
| (ii) Na | (b) Violet |
| (iii) K | (c) Brick red |
| (iv) Ca | (d) Yellow |
| (v) Sr | (e) Crimson red |
| vi) Ba | (f) Blue |
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