All alkali metals dissolve in anhydrous liquid ammonia to give a blue color solution. It is the ammoniated electron which is responsible for the blue color of the solution, and the electrical conductivity is due to ammoniated cation, $[M (N H_{3})_{x}]^{+}$ as well as the ammoniated electron, $[e (N H_{3})_{y}]^{-}$ , values of x and y depend on the extent of solvation by $N H_{3}$ . Dilute solutions are paramagnetic due to free ammoniated electrons.

What happens if alkali metals are allowed to react with concentrated liquid ammonia?

Paramagnetic character of solvated electrons is retained.

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Solvated electrons associate to form electron-pairs and paramagnetic character decreases.

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Reducing character is increased.

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Reducing character is not affected.

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Solution

The correct option is B Solvated electrons associate to form electron-pairs and paramagnetic character decreases.
As we increase concentration, the association of solvated electrons get started and paramagnetism decreases and colour changes to bronze.

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Similar questions

Read the following passage and answer the questions at the end of it.

Dilute solution of alkali metals in liquied

N H_{3}

is blue. It is the ammoniated electron which is responsible for the blue color of the solution and the electrical conductivity is due to the ammoniated cation,

[M (N H_{3})_{x}]^{+}

as well as the ammoniated electron,

[e (N H_{3})_{y}]^{-}

, values of x and y depend on the extent of solvation

(b y N H_{3})

. Dilute solutions are paramagnetic due to free electrons.

What happens if alkali metal is allowed to react with concentrated ammonia solution?

Q. Ammoniated solutions of alkali metals are reducing agents due to the presence of free or solvated electrons and can reduce :

Q. Which of following statements is not true regarding an alkali metal in a solution of

N H_{3}

Q. Choose the correct answer form the alternatives given.
When alkaline earth metals dissolve in ammonia, they form coloured solution like alkali metals . Which of the following observations regarding the reaction are correct?
(i) Dilute solution are bright blue in colour due to solvated electrons.
(ii) These solutions decompose to form amides and hydrogen.
(iii) From this solution the ammoniates

[M (N H_{3})_{6}]^{2 +}

can be recovered by evaporation.

When sodium is dissolved in lequid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to
(a) ammoniated electron (b) sodium ion
(c) sodium amide (d) ammoniated sodium ion

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The correct option is B Solvated electrons associate to form electron-pairs and paramagnetic character decreases.As we increase concentration, the association of solvated electrons get started and paramagnetism decreases and colour changes to bronze.

The correct option is B Solvated electrons associate to form electron-pairs and paramagnetic character decreases.
As we increase concentration, the association of solvated electrons get started and paramagnetism decreases and colour changes to bronze.