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प्रश्न
List out the main applications of electrolysis.
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उत्तर
The main application of electrolysis are :
- Electroplating with metals
- Electrorefining of metals
- Extraction of metals
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संबंधित प्रश्न
Out of Cu and Ag, which is more active?
An electrolytic cell is set up using two platinum electrodes and an aqueous solution of copper (II) sulphate,
(a)draw a labelled diagram of the electrolytic cell,
(b)Name the ions present in the cell,
(c)Name the ions migrating towards the anode,
(d)Name the ions migrating towards the cathode,
(e)Name the ions which will not be discharged at electrodes during electrolysis,
(f)Write the reaction at the cathode,
(g)Write the reaction at the anode,
(h)Name the spectator ion in the solution.
Give reason for the following:
The blue colour of aqueous copper sulphate fades when it is electrolysed using platinum electrodes.
The following question relate to the electroplating of an article with silver.
What ions must be present in the electrolyte?
The following question relate to the electroplating of an article with silver.
What should be the nature of the anode?
What ions must be present in a solution used for electroplating a particular metal?
A solution of silver nitrate is a good electrolyte but is not used for electroplating an article with silver.
Which solution is preferred as electrolyte, CuSO4 or FeSO4?
Describe what happens to the iron object and the copper rod.
Electroplating steel objects with silver involves a three-step process.
Step 1: A coating of copper is applied to the object.
Step 2: A coating of nickel is applied to the object.
Step 3: The coating of silver is applied to the object.
-
- A diagram of the apparatus used for step 1 is shown
- The chemical process taking place on the surface of the object is \[\ce{Cu^2+(aq) + 2e- ->Cu(s)}\]
What is the observation seen on the surface of the object? - Explain why the concentration of copper ions in the electrolyte remains constant throughout step 1.
- The chemical process taking place on the surface of the object is \[\ce{Cu^2+(aq) + 2e- ->Cu(s)}\]
- A diagram of the apparatus used for step 1 is shown
- Give two changes which would be needed in order to coat nickel on to the object in step 2.
- Write down the reaction taking place at the positive electrode during step 3.
