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For the given Nernst equation
\[
\mathrm{E}_{\text {cell }}=\mathrm{E}_{\text {cell }}^{\circ}-\frac{\mathrm{RT}}{2 \mathrm{~F}} \ln \frac{\left[\mathrm{Mg}^{2+}\right]}{\left[\mathrm{Ag}^{+}\right]^{2}}
\]
Which of the following representation is correct?
(a) \( \mathrm{Ag}^{+}|\mathrm{Ag}|\left|\mathrm{Mg}^{2+}\right| \mathrm{Mg} \)
(b) \( \mathrm{Mg}^{2+}|\mathrm{Mg}||\mathrm{Ag}| \mathrm{Ag}^{+} \)
(c) \( \mathrm{Mg}\left|\mathrm{Mg}^{2+} \| \mathrm{Ag}^{+}\right| \mathrm{Ag} \)
(d) \( \mathrm{Mg}\left|\mathrm{Mg}^{2+} \| \mathrm{Ag}\right| \mathrm{Ag}^{+} \)
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