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The sequence of ionic mobility in the aqueous solution is

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$K^{+} > N a^{+} > R b^{+} > C s^{+}$

${Cs}^{+} > R b^{+} > K^{+} > N a^{+}$

${Rb}^{+} > K^{+} > C s^{+} > N a^{+}$

${Na}^{+} > K^{+} > R b^{+} > C s^{+}$

answer is B.

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Detailed Solution

Smaller the size of an ion, more strongly it is hydrated and less is the ionic mobility. The sizes of the unhydrated ions increase in the order: ${Na}^{+} < K^{+} < R b^{+} < C s^{+}$

The sizes of the hydrated ions will be in the order: ${Cs}^{+} < R b^{+} < K^{+} < N a^{+}$

Hence, their ionic mobilities will be in the order: ${Cs}^{+} > R b^{+} > K^{+} > N a^{+}$

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