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Large reducing nature of Be is due to large hydration energy and large value of enthalpy of atomization

Alkaline earth metals dissolve in liquid ammonia to give deep blue-black solutions forming ammoniated ions

From the solutions of (b), ammoniates $[M {({NH}_{3})}_{6})_{2}^{+}$ ] can be recovered

All of the above

answer is D.

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Detailed Solution

All alkali metals dissolve in liquid ammonia giving deep blue solutions which are conducting in nature. These solutions contain ammoniated cations and ammoniated electrons as shown below:

$M + (x + y) {NH}_{3} \to M + {({NH}_{3})}_{x} + e^{-} {({NH}_{3})}_{y}$

The blue color of the solution is considered to be due to ammoniated electrons which absorb energy corresponding to the red region of the visible light for the their excitation to higher energy levels. The transmitted light is blue which imparts a blue color to the solutions.

From this solution, the ammoniates $[M {({NH}_{3})}_{6})_{2}^{+}$ can be recovered by evaporation.