Same chapter2 marksDifficulty: Medium
Why is copper refined electrolytically rather than chemically?
Electrolysis
3 marksDifficulty: Medium
Describe the electroplating of an article with silver, naming the electrodes and the electrolyte.
Original Khojo Papers practice question — not from a past board paper.
Answer
The article to be plated is made the cathode, a pure silver plate is made the anode, and the electrolyte is a solution of sodium argentocyanide. On passing the current, silver ions are discharged on the article while the anode dissolves to replace them, so the concentration of the electrolyte stays constant.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
A low current density is used so that the deposit is smooth and adheres well.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
During the electrolysis of aqueous copper sulphate using copper electrodes, state what happens at each electrode and why the colour of the solution does not change.
Electrolysis
Same chapter3 marksDifficulty: Medium
What is meant by the electrochemical series, and how does it decide which ion is discharged at the cathode?
Electrolysis
Same chapter3 marksDifficulty: Medium
Write the reactions at the cathode and at the anode during the electrolysis of molten lead bromide, and name the products.
Electrolysis
Same chapter3 marksDifficulty: Medium
Why is the electrolysis of acidified water carried out rather than pure water?
Electrolysis
Same chapter2 marksDifficulty: Medium
Name the products at each electrode during the electrolysis of acidified water with platinum electrodes.
Electrolysis