Question

Sodium dissolves in $N{H}_3$ to form a blue coloured solution. Select the incorrect statement:

• A. it is diamagnetic
• B. it is reducing agent
• C. it is good conductor of elcectricuity
• D. On heating the colour changes to bonze

Answer 1

Answer: (A)

it is diamagnetic

• Sodium(alkali metal) dissolves dissolves in liquid ammonia solution to form a blue solution characteristic of a solvated electron in liquid ammonia, which is conducting in nature, due to ammoniated electrons (solvated electron).
  
• They are highly conducting solutions.
  
• Dilute solutions of alkali metals in liquid ammonia are dark blue in colour but as the concentration increases above 3 M, the colour changes to copper-bronze and the solutions acquire metallic lustre due to formation of metal ion clusters.
  
• Hence option A is correct answer.