Question

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

Answer 1

$E </p><p>Sn </p><p>4+</p><p> /Sn </p><p>2+</p><p> </p><p>0</p><p> </p><p> =+0.15V</p><p></p><p>E </p><p>Cr </p><p>3+</p><p> /Cr</p><p>0</p><p> </p><p> =−0.74V</p><p></p><p>Now, </p><p>E </p><p>cell</p><p>0</p><p> </p><p> =E </p><p>C</p><p>0</p><p> </p><p> −E </p><p>A</p><p>0</p><p> </p><p> =0.15−(−0.74)</p><p></p><p>E </p><p>cell</p><p>0</p><p> </p><p> =+0.89V</p><p></p><p>Option B is correct.$