Which one of the following alkali metals gives hydrated salts?

(a) Li (b) Na (c) K (d) Cs

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Solution

Smaller the size of an ion, the more highly is it hydrated. Among the given alkali metals, Li is the smallest in size. Also, it has the highest charge density and highest polarising power. Hence, it attracts water molecules more strongly than the other alkali metals. As a result, it forms hydrated salts such as
LiCl.2 H₂O. The other alkali metals are larger than Li and have weaker charge densities. Hence, they usually do not form hydrated salts.

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Q. Which one of the following alkali metals gives hydrated salts?

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,

and

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. The correct order for the hydration energy of

L i^{+}

N a^{+}

and

C s^{+}

is:

Q. Consider the following statements:
1.

C s^{+}

is more highly hydrated than the other alkali metal ions.
2. Among the alkali metals

L i, N a, K

and

R b

, lithium has the highest melting point.
3. Among the alkali metals only lithium forms a stable nitride by direct combination.
Out of these statements:

Alkali metals react with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously?
(a) Li (b) Na (c) K (d) Cs

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Which one of the following alkali metals gives hydrated salts? (a) Li (b) Na (c) K (d) Cs

Which one of the following alkali metals gives hydrated salts?

(a) Li (b) Na (c) K (d) Cs