Question

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: Metallic sodium dissolved in liquid ammonia giving a deep blue solution which is paramagnetic.
Reasons R: The deep blue solution to the formation of amide.
In the light of the above statements, the correct answer from the options below:

• A. Both A and R are true but R is the correct explanation of A.
• B. A is true but R is false.
• C. A is false but R is true.
• D. Both A and R are true and R is the correct explanation of A.

Answer 1

The Correct Option is B

To solve the given problem, let's evaluate and understand both the assertion and the reason.

1. Assertion A: Metallic sodium dissolved in liquid ammonia gives a deep blue solution which is paramagnetic.
   • The statement is true. When metallic sodium is dissolved in liquid ammonia, it forms a deep blue solution. This behavior is due to the dissolution process, which results in the formation of solvated electrons that are responsible for the blue color.
   • The solution is indeed paramagnetic because of these unpaired electrons.
2. Reason R: The deep blue solution is due to the formation of amide.
   • This statement is false. The deep blue color of the solution is due to the presence of solvated electrons in liquid ammonia, not due to the formation of amide ions.
   • Amide formation occurs, but it does not contribute to the blue color or paramagnetic nature. The formation of amide ions happens later, mainly when the solution is evaporating or under different conditions.

In conclusion, the correct answer is: A is true but R is false.