Multiple Choice

Highly pure dilute solution of sodium in liquid ammonia :

Ashows blue color.
Correct Answer
Bexhibits electrical conductivity.
Correct Answer
Cproduces sodium amide.
Dproduces hydrogen gas.

Solution

(a), (b) The alkali metals dissolve in liquid ammonia without the evolution of hydrogen. The color of the dilute solution is blue.

$$Na^+ +(x+ y)NH_3 \rightarrow [Na(NH_3)_x]^+ + \underset{Anunoniated \,\,electrons}{[e(NH_3)_y]^-}$$

On heating, its blue color changes to bronze. It is an ammoniated electron which is responsible for the color and other properties. The solutions are good conductors of electricity and have strong reducing properties.

The solutions are paramagnetic in nature.

Hence options A & B are correct.

SIMILAR QUESTIONS

s - block Elements (Alkali and Alkaline Earth Metals)

A solution of sodium metal in liquid ammonia acts as a strong reducing agent due to the presence of:

s - block Elements (Alkali and Alkaline Earth Metals)

Unreacted sodium metal can be removed from liquid ammonia safely by:

s - block Elements (Alkali and Alkaline Earth Metals)

When an alkali metal dissolves in liquid ammonia the solution can acquire different colours. Explain the reasons for this type of colour change.

s - block Elements (Alkali and Alkaline Earth Metals)

The alkali metals dissolve in ammonia to give a deep blue solution which is conducting in nature. $$M +(x + y) NH_3 \rightarrow [M(NH_3)_x]^{2+} + 2[e(NH_3)y]^-$$ Which of the following is not true about the solutions are alkali metals in liquid ammonia?

s - block Elements (Alkali and Alkaline Earth Metals)

Select the correct statement(s):

s - block Elements (Alkali and Alkaline Earth Metals)

The alkali metals dissolve in liquid $$NH_3$$, it is found that :

s - block Elements (Alkali and Alkaline Earth Metals)

A solution of sodium in liquid ammonia is blue in colour due to:

s - block Elements (Alkali and Alkaline Earth Metals)

Which of the following statement about solution of alkali metals in liquid ammonia is correct ?

s - block Elements (Alkali and Alkaline Earth Metals)

Ammoniated solutions of alkali metals are reducing agents due to the presence of free ammoniated or solvated electrons that can reduce: (I) $$O_{2} $$ to $$O_{2}^{2-} $$ (II) $$K_{2} [Ni(AN)_4] $$ to $$K_{4} [Ni(CN)_4] $$ (III) Aromatic ring (IV) Non-terminal alkyne Choose the correct code:

s - block Elements (Alkali and Alkaline Earth Metals)

Which of the following metal(s) in liquid $$NH_{3} $$ with low conc. is not paramagnetic ?

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