Highly pure dilute solution of sodium in liquid ammonia 1 . shows blue colour 2 . exhibits electrical conductivity 3 . produces sodium amide 4 . produces hydrogen gas

Step-by-step solution

Highly pure dilute solution of sodium in liquid ammonia is blue in colour due to ammoniated electron. This solution is conducting due to both ammoniated cation and ammoniated electron. N a + ( x + y ) N H 3 → [ N a ( N H 3 ) x ] + + [ e ( N H 3 ) y ] -