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Alkali Metals

Which of the ...

Question

Which of the following statements is not true about the dilute solutions of alkali metals in liquid ammonia?

A

They are deep blue coloured solutions.

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B

They are highly conducting in nature.

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C

They are diamagnetic in nature.

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D

Ammoniated cations and ammoniated anions are formed in the solution.

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Solution

The correct option is B They are diamagnetic in nature.
$M + (x + y) N H_{3} \to [M (N H_{3})_{x}]^{+} + [e (N H_{3})_{y}]^{-}$
Solutions are deep blue coloured due to the absorption of light visible region by solvated electrons. It is paramagnetic due to the presence of the unpaired electrons and not diamagnetic.

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Similar questions

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?

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. The alkali metals dissolve in ammonia to give a deep blue solution which is conducting in nature.

M + (x + y) N H_{3} \to [M (N H_{3})_{x}]^{2 +} + 2 [e (N H_{3}) y]^{-}

Which of the following is not true about the solutions are alkali metals in liquid ammonia?

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.

Q. Which of the following statements are true about the dilute solutions of alkali metals in liquid ammonia?

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