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Types of Crystalline Solids

Which of the ...

Question

Which of the following alkali metal ions has lowest ionic moblity in aqueous solutions
1.Rb⁺
2.Cs⁺
3.Li⁺
4.Na⁺

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Solution

Dear Gouri Nangliya,
The lowest ionic mobility is possessed by Li⁺. The reason is smaller the size, high will be hydration and hydrated ions move slowly. Bigger the size, smaller will be the hydration and faster will be the ionic mobility.

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Q. The ionic mobility of alkali metal ions in aqueous solution is Max at
1 Na+
2 K+
3 Rb+
4 Li+

Q. Which of the following alkali metal ions has lowest ionic mobility in aqueous solutions?

Q. The mobilities of the alkali metal ions in aqueous solution are

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

Q. Consider the following statements :
(I)

C s^{+}

ion is more highly hydrated than other alkali metal ions.
(II) Among the alkali metals

L i, N a, K,

R b, L i

has the higher melting point.
(III) Among the alkali metals, only

L i

forms a stable nitride by direct combination.

Q. Atomic radii of alkali metals (M) follow the order

L i < N a < K < R b

but ionic radii in aqueous solutions follow the reverse order

L i^{+} > N a^{+} > K^{+} > R b^{+}

The reason for the reverse order is :

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