Standard electrode potential for Sn⁴⁺ / Sn²⁺ couple is +0.15 V and that for the Cr³⁺/Cr couple is -0.74. These two couples in their standard state are connected to make a cell. The cell potential will be

+0.89 V

+0.18 V

+1.83 V

+1.99 V

Solution

+0.89 V

straight E subscript Sn to the power of 4 plus end exponent divided by Sn to the power of 2 plus end exponent end subscript superscript straight o space equals space plus space 0.15 space straight V straight E subscript Cr to the power of 3 plus end exponent divided by Cr end subscript superscript space straight o end superscript space equals space minus 0.74 straight E subscript cell superscript straight o space equals space straight E subscript cathode superscript straight o left parenthesis RP right parenthesis space minus space straight E subscript anode superscript straight o space left parenthesis RP right parenthesis equals space 0.15 minus space left parenthesis negative 0.74 right parenthesis space equals space plus space 0.89 space straight V

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