It is noticed that $\mathrm{Pb}^{2+}$ is more stable than $\mathrm{Pb}^{4+}$ but $\mathrm{Sn}^{2+}$ is less stable than $\mathrm{Sn}^{4+}$. Observe the following reactions.
$$
\begin{aligned}
& \mathrm{PbO}_2+\mathrm{Pb} \rightarrow 2 \mathrm{PbO} ; \Delta_{\mathrm{r}} \mathrm{G}^{\circ}(1) \\
& \mathrm{SnO}_2+\mathrm{Sn} \rightarrow 2 \mathrm{SnO} ; \Delta_{\mathrm{r}} \mathrm{G}^{\circ}(2)
\end{aligned}
$$
Identify the correct set from the following
$$
\mathrm{PbO}_2+\mathrm{Pb} \rightarrow 2 \mathrm{PbO}
$$
$\mathrm{Pb}^{2+}$ is more stable hence reaction will be spontaneous. So $\Delta \mathrm{G}^{\circ}(1)$ is negative.
$$
\mathrm{SnO}_2+\mathrm{Sn} \rightarrow 2 \mathrm{SnO}
$$
$\mathrm{Sn}^{+2}$ is less stable, so reaction will be nonspontaneous hance $\Delta \mathrm{G}_{\mathrm{r}}^{\circ}(2)$ is positive.
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