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In view of the signs of \( \Delta_{r} G^{\circ} \) for the following reactions:
\[
\begin{array}{ll}
\mathrm{PbO}_{2}+\mathrm{Pb} \rightarrow 2 \mathrm{PbO}, & \Delta_{r} G^{\circ}0 \\
\mathrm{SnO}_{2}+\mathrm{Sn} \rightarrow 2 \mathrm{SnO}, & \Delta_{r} G^{\circ}0
\end{array}
\]
which oxidation states are more characteristics for lead and tin?
(a) For lead \( +2 \), for tin \( +2 \)
(b) For lead \( +4 \), for tin \( +4 \)
(c) For lead \( +2 \), for tin \( +4 \)
(d) For lead \( +4 \), for tin \( +2 \)
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