sblock Elements - Result Question 32
####42. Highly pure dilute solution of sodium in liquid ammonia
(a) shows blue colour
(b) exhibits electrical conductivity
(c) produces sodium amide
(d) produces hydrogen gas
$(1998,2 M)$
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Answer:
Correct Answer: 42. $(a, b)$
Solution:
- In dilute solution of $Na$ in liquid ammonia, solvated electrons are present whose emission spectrum gives blue colouration to solution.
$$ Na+NH _3 \longrightarrow Na^{+}+\underset{\text { Solvated electron }}{NH _3\left(e^{-}\right)} $$
Also, presence of solvated electrons and solvated $Na^{+}$ion makes solution highly conducting.
