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प्रश्न
(a) Copy and complete the following table, which refers to two practical applications of electrolysis.
| Anode | Electrolyte | Cathode | |
| (i) Silver plating of a spoon | A solution of potassium argentocyanide | ||
| (ii) Purification of copper | |||
| (iii) Extraction of sodium |
(b) Write the equation taking place at the anode for Q. (a).
उत्तर
(a)
| Anode | Electrolyte | Cathode | |
| (i) Silver plating of a spoon | The plate of pure, clean silver | The solution of potassium argentocyanide | Article to be electroplated |
| (ii) Purification of copper | Impure copper | The solution of copper sulphate and dilute sulphuric acid | The thin strip of pure copper |
| (iii) Extraction of sodium | Nickel, Graphite | Fused sodium chloride | Iron |
(b)
- \[\ce{Ag - e^- -> Ag^+}\]
- \[\ce{Cu - 2e^- -> Cu^{2+}}\]
- \[\ce{Cl^- - e^- -> Cl}\]
- \[\ce{Cl + Cl -> Cl2}\]
APPEARS IN
संबंधित प्रश्न
Choose the correct answer from the options given below :
The particles present in strong electrolytes are :
(A) Only molecules
(B) Mainly ions
(C) Ions and molecules
(D) Only atoms
Define the following term:
Electrolysis
State the electrode reaction at the anode during electrolysis of:
very dilute sulphuric acid.
Give reason for the following:
Ammonia is unionised in the gaseous state but in the aqueous solution, it is a weak electrolyte.
Give reason for the following:
Carbon tetrachloride is a liquid but does not conduct electricity.
Write down the changes that will be seen in each instance and explain the reason behind them.
Dilute H2SO4 was taken in an electrolytic cell and an electric current was passed through it.
Fill in the black.
The metal plate through which ____________ leaves from an electrolyte is called ____________ .It has ______________ of electrons.
Fill in the blank.
The ions which discharge on the negative electrode during electrolysis _____________ electrons, Thus the ions are said to be __________.
Identify the following reactions as either oxidation or reduction : O + 2e- → O-2
X - \[\ce{HCl <=> H^{1+} + Cl-}\] (in solution state)
Y - \[\ce{PbBr2 <=> Pb^{2+} + 2Br^{1-}}\] (in molten state)
From the above reaction X or Y, identify the reaction which exhibit:
electrolytic dissociation
