Question

Consider the following statements:
1. $C{s}^{+}$ is more highly hydrated than the other alkali metal ions.
2. Among the alkali metals $Li,Na,K$ and $Rb$, lithium has the highest melting point.
3. Among the alkali metals only lithium forms a stable nitride by direct combination.
Out of these statements:

• A. $1,2$ and $3$ are correct
• B. $1$ and $2$ are correct
• C. $1$ and $3$ are correct
• D. $2$ and $3$ are correct

Answer 1

Answer: (D)

$2$ and $3$ are correct

Hydration depends upon the size of cation, lower the size higher the hydration so $Cs$ ion have low hydration due to the larger size.
Among the alkali metals $Li,Na,K,andRb$, lithium has the highest melting point due to the smaller size.
Among the alkali metals, only lithium forms a stable nitride by direct combination as $6Li+N_2\to 2L{i}_{3}N$.