Question

Standard electrode potential for Sn$^{4+}$/Sn$^{2+}$ couple is +0.15 V and that for the Cr$^{3+}$/Cr couple is -0.74 V. The two couples in their standard states are connected to make a cell. The cell potential will be:

• A. +1.19 V
• B. +0.89 V
• C. +0.18 V
• D. +1.83 V

Hint:

The cell potential is calculated by subtracting the anode potential from the cathode potential.

Answer 1

The Correct Option is B

Step 1: Understanding the cell potential. The cell potential is calculated by subtracting the anode potential from the cathode potential. The two given standard electrode potentials are for the Sn$^{4+}$/Sn$^{2+}$ couple (+0.15 V) and the Cr$^{3+}$/Cr couple (-0.74 V).

Step 2: Calculation. The cell potential is given by: \[ E_{\text{cell}} = E_{\text{cathode}} - E_{\text{anode}} = (+0.15 \, \text{V}) - (-0.74 \, \text{V}) = +0.89 \, \text{V} \]

Step 3: Conclusion. Thus, the cell potential is +0.89 V, corresponding to option (B).