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प्रश्न
Starting with sodium chloride how would you proceed to prepare sodium metal.
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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 : \[\ce{Cl- + e- -> Cl}\]
\[\ce{Cl + Cl -> Cl_2}\]
संबंधित प्रश्न
Find the oxidation state of sodium in Na2O2.
Potassium carbonate cannot be prepared by Solvay process. Why?
Describe two important uses of each of the following caustic soda.
What happens when sodium metal is dropped in water?
What happens when sodium metal is heated in the free supply of air?
Write a balanced equation for the reaction between Na2O2 and water.
Complete the following reactions.
\[\ce{O^{-}2 + H2O ->}\]
In the Solvay process, can we obtain sodium carbonate directly by treating the solution containing (NH4)2CO3 with sodium chloride? Explain.
Match the compounds given in Column I with their uses mentioned in Column II.
| Column I | Column II |
| (i) CaCO3 | (a) Dentistry, ornamental work |
| (ii) Ca(OH)2 | (b) Manufacture of sodium carbonate from caustic soda |
| (iii) CaO | (c) Most negative E value among alkali O metals. |
| (iv) CaSO4 | (c) Manufacture of high-quality paper |
| (d) Used in white washing |
Match the elements given in Column I with the colour they impart to the flame given in Column II.
| 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 |
\[\ce{NaOH}\] is manufactured by the electrolysis of brine solution. The products of the reaction are ______.
Which of the following metal hydroxides does not dissolve in sodium hydroxide solution?
The pair of compounds which cannot exist together in solution is ______.
Which sodium salt will be heated with soda lime to obtain propane?
