Ge (II) compounds are powerful reducing agents whereas Pb (IV)...

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1. A$\mathrm{Pb}$ is more electropositive than $\mathrm{Ge}$.
2. Bionisation potential of lead is less than that of Ge.
3. Cionic radii of $\mathrm{Pb}^{2+}$ and $\mathrm{Pb}^{4+}$ are larger than that of $\mathrm{Ge}^{2+}$ and $\mathrm{Ge}^{4+}$
4. Dmore pronounced inert pair effect in lead has.