Electrochemistry - Result Question 36
####38. 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 :
[2011]
(a) $+1.19 V$
(b) $+0.89 V$
(c) $+0.18 V$
(d) $+1.83 V$
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Solution:
- (b) The couple for which SRP value is high, will act as cathode and the other couple will act as an anode.
$ \begin{aligned} E _{\text{cell }}^{0} & =E _{\text{cathode }}^{0}-E _{\text{anode }}^{0} \\ & =0.15 V-(-0.74 V)=+0.89 V \end{aligned} $
