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Consider the cell \( \mathrm{Ag}|\mathrm{AgBr}(\mathrm{s})| \mathrm{Br}^{-} \| \mathrm{AgCl}(\mathrm{s}), \mathrm{Ag} \mid \mathrm{Cl}^{-} \)at \( 25^{\circ} \mathrm{C} \). The solubility product constants of \( \mathrm{AgBr} \) \( \& \mathrm{AgCl} \) are \( 5 \times 10^{-13} \& 1 \times 10^{-10} \) respectively. For what ratio of the concentrations of \( \mathrm{Br}^{-} \& \mathrm{Cl}^{-} \)ions
\( \mathrm{P} \) would the emf of the cell be zero?

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