Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:Assertion A: Metallic sodium dissolves in liquid ammonia giving a deep blue solution which is paramagnetic.Reason R: The deep blue solution is due to the formation of amide.In the light of the above statements, choose the correct answer:
- ABoth A and R are true and R is the correct explanation of A
- BBoth A and R are true but R is not the correct explanation of A
- CA is true but R is false
- DA is false but R is true
Solution & Step-by-step Explanation
Assertion A is true: Sodium dissolves in liquid ammonia to produce ammoniated cations and ammoniated electrons. The presence of free ammoniated electrons makes the solution blue and paramagnetic.
Reason R is false: The blue colour is due to the ammoniated electrons (), not the formation of sodamide (). Amide formation usually occurs slowly or with a catalyst, causing the blue colour to fade and gas to evolve.
Reason R is false: The blue colour is due to the ammoniated electrons (), not the formation of sodamide (). Amide formation usually occurs slowly or with a catalyst, causing the blue colour to fade and gas to evolve.