Q. Standard electrode potential for Sn⁴⁺/Sn²⁺ couple is +0.15 V and that for the Cr³⁺/Cr couple is −0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will be
A) +1.83 V
B) +1.19 V
C) +0.89 V
D) +0.18 V
Explanation
[Solution from source] The couple with higher reduction potential, Sn⁴⁺/Sn²⁺, is the cathode and Cr is the anode. E°cell = 0.15 − (−0.74) = +0.89 V. Multiplying by stoichiometric coefficients (to get 1.83 V) is wrong since E° is intensive. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.