A) solvated electron, \[{{e}^{-}}(N{{H}_{3}})_{x}^{-}\]
B) solvated atomic sodium, \[Na{{(N{{H}_{3}})}_{y}}\]
C) \[(N{{a}^{+}}+N{{a}^{-}})\]
D) \[NaN{{H}_{2}}+{{H}_{2}}\]
Correct Answer: A
Solution :
All alkali metals dissolve in liquid ammonia \[M+(x+y)N{{H}_{3}}\xrightarrow{{}}{{M}^{+}}{{(N{{H}_{3}})}_{x}}+{{e}^{-}}{{(N{{H}_{3}})}_{y}}\] These electrons are excited to higher energy levels and the absorption of photons occurs in the red region of the spectrum. Thus, solution appears blue.
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