Comment on each of the following observations :
The mobilities of alkali metal ions in aqueous solution are $: L i^{+} < N a^{+} < K^{+} < R b^{+} < C s^{+}$

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Solution

On moving down the group, the atomic and ionic sizes of alkali metals increases. As the size increases, the extent of hydration decreases. The extent of hydration $&$ ionic mobility are inversely proportional.
Hence, the increasing order of mobilitie of alkali metal is
$L i^{+} < {N a}^{+} < K + < R b^{+} < {C s}^{+}$

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Comment on each of the following observations:

(a) The mobilities of the alkali metal ions in aqueous solution are Li⁺ < Na⁺ < K⁺< Rb⁺ < Cs⁺

(b) Lithium is the only alkali metal to form a nitride directly.

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

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

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