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Empirical & Molecular Formula

Ionic radii o...

Question

Ionic radii of alkali metal ions in water follow the following order

A

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B

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C

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D

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Solution

The correct option is A
$L i^{⨁}$ has the highest hydration enthalpy, hence gets surrounded by maximum number of $H_{2} O$ molecules and exhibits largest size in solution.

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The ionic radii of alkali metal ions in water (hydrated radii) are in the order

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

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 :

Q. Arrange the following ions in order of decreasing ionic radii:

L i^{2 +}, H e^{+}, B e^{3 +} .

Q. The ionic mobility of alkali metal ions in aqueous solution is maximum for:

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