Advertisements
Advertisements
प्रश्न
Give reason for the following:
The blue colour of aqueous copper sulphate fades when it is electrolysed using platinum electrodes.
Advertisements
उत्तर
The blue colour of copper ions fades due to the decrease in Cu+2 ions, and finally, the solution becomes colourless as soon as the Cu+2 ions are finished.
APPEARS IN
संबंधित प्रश्न
Give reasons why In the electroplating of an article with silver, the electrolyte sodium argentocyanide solution is preferred over silver nitrate solution.
Choose the correct answer from the options given below:
The electrolyte used for electroplating an article with silver is
A. Silver nitrate solution
B. Silver cyanide solution
C. Sodium argentocyanide solution
D. Nickel sulfate solution
Give one word or phrase for the following:
Electrolytic deposition of a superior metal on a baser metal.
How would you change Cu2+ ion to Cu?
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.
State the electrode reaction at the anode during electrolysis of:
Aqueous copper sulphate solution.
Explain the term:
Electro refining
How is impure copper purified by electrolysis ? Explain.
The following question relate to the electroplating of an article with silver.
What ions must be present in the electrolyte?
Mr Ramu wants electrolyte his key chain with nickel to prevent rusting. For this electroplating
(i) Name the electrolyte
(ii) Name the cathode
(iii) Name the anode
(iv) Give the reaction at the cathode
(v) Give the reaction at the anode
