MHT CET202611 April 2026Evening ShiftChemistryElectrochemistryActual
The standard potential of Cu ⁺²/ Cu is 0.34 V at 298 K. Calculate its potential at the same temperature when the Cu ⁺² ion concentration is 0.1 M.
Options
- A0.64 V
- B0.34 V
- C0.31 V
- D0.37 V
Correct answer
C. 0.31 V
Step-by-step solution
The reduction half-reaction is Cu ⁺² + 2e⁻ Cu . Using the Nernst equation for the electrode potential: E = E^ - 0.0591 n 1 [ Cu ⁺²] Given E^ = 0.34 V, n = 2 , and [ Cu ⁺²] = 0.1 M. E = 0.34 - 0.0591 2 1 0.1 E = 0.34 - 0.0295 10 E = 0.34 - 0.0295 1 E = 0.3105 V 0.31 V. Answer: 0.31 V