For the electrochemical cell:
Mn(s)|Mn2+(aq)|| VO2
+(aq), H+(aq), VO2+(aq)|Pt
What is the half-reaction at the cathode?
a. Mn2+(aq) + 2e− → Mn(s)
b. Mn(s) → Mn2+(aq) + 2e−
c. VO2+(aq) + H2O(l) → VO2+(aq) + 2H+(aq) + e−
d. VO2+(aq) + 2H+(aq) + e− → VO2+(aq) + H2O(l)
e. Pt(s) → Mn(s)