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Standard electrode potentials for a few half cells are mentioned below :
$
\begin{array}{l}
E_{Cu^{2+} / Cu}^{o}=0.34 V, E_{Zn^{2+} / Zn}^{o}=-0.76 V \\
E_{Ag^{+} / Ag}^{o}=0.80 V, E_{Mg^{2+} / Mg}^{o}=-2.37 V
\end{array}
$
Which one of the following cells gives the most negative value of $\Delta G ^{ o }$ ?

• ✓
  $Zn \left| Zn ^{2+}(1 M ) \| Ag ^{+}(1 M )\right| Ag$
• B
  $Zn \left| Zn ^{2+}(1 M )\right|\left| Mg ^{2+}(1 M )\right| Mg$
• C
  $Ag \left| Ag ^{+}(1 M )\right|\left| Mg ^{2+}(1 M )\right| Mg$
• D
  $Cu \left| Cu ^{2+}(1 M ) \| Ag ^{+}(1 M )\right| Ag$