Question

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

Answer 1

Answer: (B)

exhibits electrical conductivity

Answer 2

When sodium dissolves in liquid ammonia, it forms a deep blue-coloured solution. This blue color is a distinctive feature of this type of solution and can be used to identify its presence.

$Na + NH_3 \rightarrow Na^+ + _{Solvated\, \, electron}^{\, \, \, NH_3(e^-)}$

• The solution is also a good conductor of electricity.
• When an electric potential is applied across the solution, the sodium ions and ammonia molecules become mobile, allowing the flow of electric current.

Therefore, a highly pure dilute solution of sodium in liquid ammonia shows blue color and exhibits electrical conductivity.

Both Options A and B are correct

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