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`. These two couples in their standard state 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

Answer 1

Correct Answer - B
`E_(cell)^(@) = E_("cathode")^(@) - E_("anode")^(@)`
`0.15 - (0.74) = 0.15 + 0.74 = 0.89V`