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A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.The standard emf of the cell is

$\begin{array}{1 1}(1.33+0.77)V\\(1.33-0.77)V\\-(1.33+0.77)V\\(-1.33+0.77)V\end{array} $

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Answer : (1.33-0.77)V
The standard emf of the cell is $E^{\large\circ}=E_R^{\large\circ}-E_L^{\large\circ}=1.33V-0.77V=0.56V$
answered Jul 21, 2014 by sreemathi.v

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