Q. Which of the following electrolyte can be used to obtain H₂S₂O₈ by the process of electrolysis?
A) Dilute solution of sodium sulphate.
B) Acidified dilute solution of sodium sulphate.
C) Dilute solution of sulphuric acid
D) Concentrated solution of sulphuric acid
Explanation
[Solution by Dr. Abubacker] Peroxodisulphuric acid is made by electrolysis of concentrated (about 50%) H₂SO₄ at high current density: 2 HSO₄⁻ → H₂S₂O₈ + 2e⁻ at the anode. In dilute solutions water is oxidised instead. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.