JEE Main202529 Jan 2025Morning ShiftChemistryElectrochemistryActual
For a ( Mg | Mg ²⁺( aq ) | | Ag ⁺( aq ) | Ag ) the correct Nernst Equation is :
Options
- A( E _ cell = E _ cell ^ o - RT 2 ~F [ Ag ⁺ ] [ Mg ²⁺ ] )
- B( E _ cell = E _ cell ^ o + RT 2 ~F [ Ag ⁺ ]^2 [ Mg ²⁺ ] )
- C( E _ cell = E _ cell ^ o - RT 2 ~F [ Ag ⁺ ]^2 [ Mg ²⁺ ] )
- D( E _ cell = E _ cell ^ o - RT 2 ~F [ Mg ²⁺ ] [ Ag ⁺ ] )
Correct answer
B. ( E _ cell = E _ cell ^ o + RT 2 ~F [ Ag ⁺ ]^2 [ Mg ²⁺ ] )
Step-by-step solution
array lll Cathode & ( Ag +( aq )+ e ⁻ . & Ag ) 2 Anode & Mg & Mg ²⁺( aq )+2 e ⁻ array By Nernst equation aligned & E _ cell = E _ cell ^ - RT nF Q & E _ cell = E _ cell ^ - RT nF [ Mg ²⁺ ] [ Ag ⁺ ]^2 & = E _ cell ^ + RT 2 ~F [ Ag ⁺ ]^2 [ Mg ²⁺ ] aligned