Question:
E°Cell for some half cell reactions are given below. Based on these mark
the correct answer.
(a) H+(aq) + e– →1/2H2(g) ; E°cell = 0.00V
(b) 2H2O (l) → O2 (g) + 4H+(aq) + 4e–: E°cell = 1.23V
(c) 2SO42– (aq) → S2O82– (aq) + 2e– ; E°cell = 1.96V
(i) In dilute sulphuric acid solution, hydrogen will be reduced at the cathode.
(ii) In concentrated sulphuric acid solution, water will be oxidised at the anode.
(iii) In dilute sulphuric acid solution, water will be oxidised at the anode.
(iv) In dilute sulphuric acid solution, SO42– ion will be oxidised to tetrathionate ion at the anode.
Solution:
Option (i) and (iii) are the answer