MHT CET202520 Apr 2025Morning ShiftChemistryElectrochemistryActual
Standard potential ( E ^* ) of Zn ⁺² _ (a q) +2 e Zn _ (s) is -0.76 V . What is standard potential of reaction 2 Zn _ ( s ) 2 Zn ⁺² _ ( aq ) +4 e ?
Options
- A-1.52 ~V
- B+1.52 ~V
- C-0.76 ~V
- D+0.76 ~V
Correct answer
D. +0.76 ~V
Step-by-step solution
The given standard reduction potential refers to the reaction: Zn ²⁺_ (aq) + 2e^- Zn _ (s) , with E^ = -0.76 V Standard electrode potentials are intensive properties and do not change with stoichiometric coefficients. The target reaction represents the oxidation of zinc: 2 Zn _ (s) 2 Zn ²⁺_ (aq) + 4e^- This is exactly twice the reverse of the given reduction reaction. Reversing the reaction changes the sign of the potential, while the intensive nature of E^ ensures it remains unchanged when multiplied by any coeffi