Which of the following ion is expected to have highest value of molar conductivity at infinite dilution in the aqueous solution?
A$\mathrm{Na^{+}}$
B$\mathrm{K}^{+}$
C$\frac{1}{2} \mathrm{Ca}^{2+}$
D$\mathrm{H}^{+}$
Answer & Solution
Correct answer: D. $\mathrm{H}^{+}$
At infinite dilution, ionic molar conductivity depends on ionic mobility in water. Among common cations, $\mathrm{H^+}$ has exceptionally high mobility because it moves through the hydrogen-bonded network of water by proton hopping.
So the highest limiting molar conductivity is for $\mathrm{H^+}$.
Final check against the options: $\mathrm{Na^+}$, $\mathrm{K^+}$, $\frac{1}{2}\mathrm{Ca^{2+}}$, and $\mathrm{H^+}$. The matching option is $\mathrm{H^+}$, which is option $\mathrm{D}$.
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