The emf of the cell in which the following reaction \( \mathrm{Zn}(\mathrm{s})+\mathrm{Ni}^{2+}(...

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The emf of the cell in which the following reaction \( \mathrm{Zn}(\mathrm{s})+\mathrm{Ni}^{2+}(\mathrm{a}=0.1) \square \mathrm{Zn}^{2+}(\mathrm{a}=1.0)+\mathrm{Ni}(\mathrm{s}) \) occurs, is found to be \( 0.5105 \mathrm{~V} \) at \( 298 \mathrm{~K} \). The standard emf of the cell is
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