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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 :

1. +1.19 V
2. +0.89 V
3. +0.18 V
4. +1.83 V

Correct answer: +0.89 V

Solution

The cell potential is calculated as E°cell = E°cathode - E°anode. Here, Sn4+/Sn2+ acts as the cathode (+0.15 V) and Cr3+/Cr acts as the anode (-0.74 V). Substituting, E°cell = 0.15 - (-0.74) = +0.89 V.

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