Question

Which of the following statement(s) is/are true regarding a highly pure dilute solution of sodium in liquid ammonia?

• A. It shows blue colour
• B. It exhibits electrical conductivity
• C. Reaction to produce sodium amide can happen photochemically
• D. It produces hydrogen gas on leaving it undisturbed for some time

Answer 1

Answer: (A), (B), (C), (D)

It produces hydrogen gas on leaving it undisturbed for some time

$Na+\left(x+y\right)N{H}_3\to \left[Na\right(N{H}_3{)}_x{]}^{+}+\left[e\right(N{H}_3{)}_y{]}^{-}$
a) Blue colour is due to ammoniated electrons which absorbs light in the visible region.
b) It conducts electricity due to the presence of ammoniated electrons.
c) The reaction for formation of amide : $N{a}^{+}+e^{-}+N{H}_3\to NaN{H}_2+\frac{1}{2}{H}_2$
d) $H_2$ gas is produced when solution is left standing for some time
All the options are correct.