Advertisements
Advertisements
Question
Write equations for the reactions taking place at the two electrodes (mentioning clearly the name of the electrode) during the electrolysis of Molten lead bromide with inert electrodes
Solution
The cathode and anode are both made of graphite plates.
Reaction at the cathode: `Pb^(2+) + 2e^(-) -> Pb`
Reaction at the anode: `Br^(-) - e^(-) -> Br`
`Br + Br -> Br_2`
APPEARS IN
RELATED QUESTIONS
Give reasons why Sodium Chloride will conduct electricity only in the fused or aqueous solution state.
Define the following term:
Electrolysis
What is the difference between:
Electrolytic dissociation and ionisation.
Give reason for the following:
The ratio of hydrogen and oxygen formed at the cathode and anode is 2 : 1 by volume.
(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).
Define the term : Electrolysis
Explain, why electrolysis is an example of redox reaction?
Why is it necessary to add acid to water before proceeding with electrolysis of 'water'?
Choose A, B, C or D to match the descriptions (i) to (v) below . Some alphabets may be repeated.
(A) Non-electrolyte, (B) Strong electrolyte, (C) Weak electrolyte, (D) Metallic conductor
(i) Molten ionic compound
(ii) Carbon tetrachloride
(iii) An aluminium wire
(iv) A solution containing solvent molecules, solute molecules and ions formed by the dissociation of solute molecules
(v) A sugar solution with sugar molecules and water molecules.
When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are:
