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Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution?

Option: 1

\mathrm{Be}^{2+}


Option: 2

\mathrm{Mg}^{2+}


Option: 3

\mathrm{Ca}^{2+}


Option: 4

\mathrm{Sr}^{2+}


Answers (1)

Greater the charge density on an ion, greater is the extent of hydration and lesser is the ionic mobility in aqueous solution.

Order of Ionic mobility is given as

\mathrm{Be}^{2+}<\mathrm{Mg}^{2+}<\mathrm{Ca}^{2+}<\mathrm{Sr}^{2+}

Hence, the correct answer is Option (4).

Posted by

Ramraj Saini

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