MHT CET202312 May 2023Evening ShiftChemistryElectrochemistryActual
Calculate the E _ cell for Zn _ ( s ) | Zn _ (0.1 M ) ⁺⁺ | | Cr _ (0.1 M ) ⁺⁺⁺ | Cr _ ( s ) at 25^ C if E _ cell ^ is 0.02 ~V
Options
- A-0.05 ~V
- B0.03 ~V
- C-0.06 ~V
- D0.07 ~V
Correct answer
B. 0.03 ~V
Step-by-step solution
The reaction is aligned & 3 Zn _ ( s ) +2 Cr _ (0.1 M ) ³⁺ 3 Zn _ (0.1) ²⁺+2 Cr _ ( s ) & E _ cell = E _ cell ^ - 0.0592 ~V n ₁₀ [ Zn ²⁺ ]^3 [ Cr ³⁺ ]^2 aligned aligned E _ cell & =0.02 ~V - 0.0592 ~V 6 ₁₀ (0.1)^3 (0.1)^2 & =0.02 ~V - 0.0592 ~V 6 ₁₀ 0.1 & =0.02 ~V + 0.0592 ~V 6 1 & =0.02 ~V +0.0099 ~V & =0.03 ~V aligned