MHT CET Medical202621 April 2026Morning ShiftChemistryElectrochemistryActual
Calculate the emf of the following cell at 25^ C Zn(s) Zn ⁺⁺(0.1 M ) Cu ⁺⁺(0.05 M ) Cu(s) if E^ cells 1.1V.
Options
- A1.091 V.
- B1.2 V.
- C1.52 V.
- D1.41 V
Correct answer
A. 1.091 V.
Step-by-step solution
The cell reaction is Zn(s) + Cu ²⁺( aq ) Zn ²⁺( aq ) + Cu(s) Number of electrons transferred, n = 2 Using the Nernst equation: E_ cell = E^ _ cell - 0.0591 n [ Zn ²⁺] [ Cu ²⁺] Substituting the given values: E_ cell = 1.1 - 0.0591 2 0.1 0.05 E_ cell = 1.1 - 0.02955 2 E_ cell = 1.1 - 0.02955 0.3010 E_ cell = 1.1 - 0.0089 E_ cell = 1.0911 V Answer: 1.091 V.