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All alkali metals dissolve in liquid amm...

All alkali metals dissolve in liquid ammonia giving highly conducting ____ solutions.

A

colorless

B

deep blue

C

yellow

D

black

Text Solution

Verified by Experts

The correct Answer is:
B
Dilute solutions of alkali metals in liquid `NH_(3)` are dark blue in color and contain ammoniated metal ions and ammoniated electrons :
`M+(x+y)NH_(3)to M^(+)(NH_(3))_(x)+e^(-)(NH_(3))_(y)`
When light falls on ammoniated electrons, they get excited to higer energy levels by absorbing the red part of visible light. As a result, the transmitted light is blue imparting blue color to the solution.
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Knowledge Check

  • 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 have 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

  • 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

  • Alkali metals readily dissolve in liquid ammonia to give blue coloured solutions. The blue colour is believed to be due to

    A
    Ammoniated cations
    B
    Ammoniated anions
    C
    Ammoniated electrons
    D
    Ammoniated cation and ammoniated electrons

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    The alkali metals react with most non-metals to form hydrides, oxides, sulphides, carbides, phosphides and other compounds. The binary compounds of all alkali metals are ionic with M^(+) cations. The alkali metals easily ionize and readily reduce hydrogen ions. They react with ammonia to evolve hydrogen and form blue coloured solutions. 2M(s) + 2H_2O (l) to 2MOH(aq) + H_2(g) 2M(s) + 2NH_3 (l) to 2MNH_2(am) + H_2(g) Why do alkali metals dissolve in liquid ammonia to give blue coloured solutions ?

    Alkali metals dissolve in ammonia to give a blue solution which is conducting due to

    STATEMENT-1: Alkali metals dissolve in liquid ammonia to give blue solutions. and STATEMENT-2: Alkali metals in liquid ammonia give solvated species of the type [M(NH3)* ( M alkali metals)

    Statement- 1 . Alkali metals dissolved in liquid ammonia to give blue solutions . Statement- 2 . Alkali metals in liquid ammonia give solvated species of the type [M(NH_(3))_(n)]^(+) (M = alkali metals)

    Statement I: Alkali metals dissolve in liquid ammonia to give blue solutions. Statement II: Alkali metals in liquid ammonia give solvated species of the type [M(NH_(3))_(n)]^(o+) (M = alakli metals).

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