Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution?
Select the correct option:
A
$\mathrm{Be}^{2+}$
B
$\mathrm{Mg}^{2+}$
C
$\mathrm{Ca}^{2+}$
D
$\mathrm{Sr}^{2+}$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
Highest ionic mobility corresponds to lowest extent of hydration and highest size of gaseous ion.
Hence $\mathrm{Sr}^{2+}$ has the highest ionic mobility in its aqueous solution.
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