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Chemistry · PYQ NEET UG 2023

हिन्दी

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : \n Assertion A : Metallic sodium dissolves in liquid ammonia giving a deep blue solution, which is paramagnetic.\nReasons R : The deep blue solution is due to the formation of amide.\nIn the light of the above statements, choose the correct answer from the options given below :

  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true but R is NOT the correct explanation of A.
  3. A is true but R is false.
  4. A is false but R is true.

Correct answer · Option 3

A is true but R is false.

Explanation

Metallic sodium dissolves in liquid ammonia to form ammoniated electrons, which impart a deep blue color and paramagnetism. Thus, A is true, but R is false as the blue color is due to ammoniated electrons, not amide.
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