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Standard XII
Chemistry
Nitrogen
Which of foll...
Question

Which of following statements is not true regarding an alkali metal in a solution of NH3?

A
Blue colouration happens due to ammoniated electrons
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B
Blue colour changes to bronze, on dilution due to the formation of metal clusters
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C
Increasing the concentration of the alkali metal makes the solution less paramagnetic due to electron-electron pairing
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D
On heating, blue colour disappears due to formation of a metal amide and H2 gas
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Solution

The correct option is B Blue colour changes to bronze, on dilution due to the formation of metal clusters
Blue coloured solution becomes bronze coloured by increasing the concentration due to the formation of metal clusters.

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Q.

The Alkali metals dissolve in liquid NH3. It is observed that


Q.
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(NH3)x]+ as well as the ammoniated electron, [e(NH3)y]−, values of x and y depend on the extent of solvation by NH3. Dilute solutions are paramagnetic due to free ammoniated electrons.

What happens if alkali metals are allowed to react with concentrated liquid ammonia?
Q.
Read the following passage and answer the questions at the end of it.
Dilute solution of alkali metals in liquiedNH3 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(NH3)x]+ as well as the ammoniated electron, [e(NH3)y]−, values of x and y depend on the extent of solvation (byNH3). Dilute solutions are paramagnetic due to free electrons.

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

Q. The metallic sodium disolves in liquid amonia to form a deep blue coloured solution. The deep blue colour is due to formation of.
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(NH3)6]2+ can be recovered by evaporation.
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