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Topic: Modern periodic law and periodic table, s, p, d, f blocks· Classification of Elements and Periodicity in Properties

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.Reasons R : The deep blue solution is…

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.

Reasons R : The deep blue solution is due to the formation of amide.

In the light of the above statements, choose the correct answer from the options given below :

1. A is false but R is true.

2. Both A and R are true and R is the correct explanation of A.

3. Both A and R are true but R is NOT the correct explanation of A.

4. A is true but R is false.

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Answer: 4. A is true but R is false.

Key idea: Sodium in liquid ammonia gives ammoniated electrons.

\(\mathrm{Na + (x+y)NH_3 \rightarrow [Na(NH_3)_x]^+ + [e(NH_3)_y]^-}\). The deep blue colour is from the ammoniated electron, and the unpaired electron makes the solution paramagnetic. A is true. R is false because the blue colour is not due to amide (amide forms slowly on standing, giving a bronze/colourless solution with \(\mathrm{H_2}\)). Option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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