JEE MAIN - Chemistry (2025 - 28th January Morning Shift - No. 10)
Consider the following elements $\mathrm{In}, \mathrm{Tl}, \mathrm{Al}, \mathrm{Pb}, \mathrm{Sn}$ and Ge .
The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are
+4 and +1
+4 and +3
+1 and +4
+2 and +3
Explanation
Among $\mathrm{Al}, \mathrm{In}, \mathrm{Tl}, \mathrm{Ge}, \mathrm{Sn}, \mathrm{Pb}$, the metal having highest $\mathrm{IE}_1$ is Ge and lowest $\mathrm{IE}_1$ is $\mathrm{In}$.
Most stable oxidation state of Ge is +4 and In is +3 .
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