The correct order of electrical conductivity of alkali metals ions in their aqueous solution for ${Cs}^{+}, K^{+}, {Na}^{+}, and {Li}^{+}$ is

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$K^{+} > {Cs}^{+} > {Li}^{+} > {Na}^{+}$

${Li}^{+} > {Na}^{+} > K^{+} > {Cs}^{+}$

${Cs}^{+} > K^{+} > {Na}^{+} > {Li}^{+}$

${Cs}^{+} > K^{+} > {Li}^{+} > {Na}^{+}$

answer is A.

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Detailed Solution

As smaller the size of the ion, larger the charge of the ion, hence greater the hydration and smaller ionic conductance and mobility of the ion. So, the increasing order of mobility the alkali metal ions in aqueous solution is:

${C S}^{+} > K^{+} > {N a}^{+} > L i^{+}$

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