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Question

The ion having highest mobility in aqueous solution is

A
Be2+
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B
Mg2+
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C
Ca2+
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D
Ba2+
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Solution

The correct option is D Ba2+
On going down the group the size of metal ion increase so hydration energy decreases. Since Ba2+ is the heaviest ion it is least hydrated. As a result, its size of hydrated ion becomes lesser than any other hydrated alkaline earth metal cation and hence has the highest ionic mobility.

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