Which of the following alkali metal ions has lowest ionic mobility in aqueous solution?

R b^{+}

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C a^{+}

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N a^{+}

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L i^{+}

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Solution

The correct option is D $L i^{+}$
As the size of ions increases the hydration of ions decreases. Higher the size of hydrated ion lower the ionic mobility. Among the alkali metal Li+ gets most hydrated in aqueous solution. Lithium has the lowest mobility.
The mobility of ions decrease in the order given below.

Hence, the correct option is D.

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Similar questions

L i^{+} < N a^{+} < K^{+} < R b^{+} < C s^{+}

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?

(L i^{\oplus}, N a^{\oplus}, K^{\oplus}, R b^{\oplus})

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