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Dilute solutions of alkali metals in liq...

Dilute solutions of alkali metals in liquid `NH_(3)` are blue. It is the ammoniated electron which is responsible for the blue colour of the solution, and the electrical conductivity is due to the ammoniated cation, `[M(NH_(3))_(x)]^(+)` as well as the ammoniated electrons, `[e(NH_(3))_(y)]^(-)`, values of x and y depend on the extent of solvation (by `NH_(3)`). Dilute solutions are paramagnetic due to free electrons.
What happens if alkali metals is allowed to react with concentrated liquid ammonia?

A

Paramagnetic character of solvated electrons is retained

B

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

C

Reducing character is increased.

D

Reducing character is not affected.

Text Solution

Verified by Experts

The correct Answer is:
B

`M(s)+NH_(3)("liq.") rarr M^(+). (NH_(3))_(x) + bar(e).(NH_(3))_(y)`
`{:("excess",,"Ammoniated "bar(e)" responsible for"),(,,"blue color & reducing character."):}`
If conc. of solution is increased, then association of solvated electrons get started hence, paramagnetism decreases.
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All alkali metals dissolve in anhydrous liquid ammonia to give blue colour solution. It is the ammoniated electron which is reponsible for the blue colour of the solution, and the electrical conductivity is due to the ammoniated cation, [M(NH_(3))_(x)]^(+) as well as the ammoniated electron, [e(NH_(3))_(y)]^(-) , value of x and y depend on the extent of solvation by NH_(3) . Dilute solutions are paramagnetic due to free ammoniated electrons. Q. 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(CN)_(4)] " to "K_(4)[Ni(CN)_(4)] (III) Aromatic ring (IV) Non-terminal alkyne Choose the correct code:

Alkali metals (M) dissolve in liquid NH_3 to give

Knowledge Check

  • Dilute solutions of alkali metals in liquid NH_(3) are blue. It is the ammoniated electron which is responsible for the blue colour of the solution, and the electrical conductivity is due to the ammoniated cation, [M(NH_(3))_(x)]^(+) as well as the ammoniated electrons, [e(NH_(3))_(y)]^(-) , values of x and y depend on the extent of solvation (by NH_(3) ). Dilute solutions are paramagnetic due to free electrons. Ammoniated solution 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(CN)_(4)] to K_(4) [Ni(CN)_(4)] [III] aromatic ring " "[IV] non-terminal alkyne Choose the correct code

    A
    `III` & `IV`
    B
    `II` & `III`
    C
    `I, II, III` & `IV`
    D
    `I, III` & `IV`
  • All alkali metals dissolve in anhydrous liquid ammonia to give blue colour solution. It is the ammoniated electron which is reponsible for the blue colour of the solution, and the electrical conductivity is due to the ammoniated cation, [M(NH_(3))_(x)]^(+) as well as the ammoniated electron, [e(NH_(3))_(y)]^(-) , value of x and y depend on the extent of solvation by NH_(3) . Dilute solutions are paramagnetic due to free ammoniated electrons. Q. 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(CN)_(4)] " to "K_(4)[Ni(CN)_(4)] (III) Aromatic ring (IV) Non-terminal alkyne Choose the correct code:

    A
    III and IV
    B
    II and III
    C
    I, II, III and IV
    D
    I, III and IV
  • All alkali metals dissolve in anhydrous liquid ammonia to give blue colour solution. It is the ammoniated electron which is reponsible for the blue colour of the solution, and the electrical conductivity is due to the ammoniated cation, [M(NH_(3))_(x)]^(+) as well as the ammoniated electron, [e(NH_(3))_(y)]^(-) , value of x and y depend on the extent of solvation by NH_(3) . Dilute solutions are paramagnetic due to free ammoniated electrons. Q. Which of the following statement about solution of alkali metals in liquid ammonia is correct?

    A
    The solution has strong oxidizing properties
    B
    Both the dil. Solution as well as conc. Solution are equally paramagnetic in nature
    C
    Charge transfer is responsible for the colour of the solution
    D
    None of these
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    The blue colour of solution of ammonia and alkali metals is due to which species?

    All alkali metals dissolve in anhydrous liquid ammonia to give blue colour solution. It is the ammoniated electron which is reponsible for the blue colour of the solution, and the electrical conductivity is due to the ammoniated cation, [M(NH_(3))_(x)]^(+) as well as the ammoniated electron, [e(NH_(3))_(y)]^(-) , value of x and y depend on the extent of solvation by NH_(3) . Dilute solutions are paramagnetic due to free ammoniated electrons. Q. Which of the following statement about solution of alkali metals in liquid ammonia is correct?

    The alkali metals dissolve in liquid NH_(3) , it is found that:

    Color of alkalimetals in liquid ammonis is due to

    Blue colour of alkali and alkaline earth metals in liquid NH_3 is due to