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The alkali metals react with most non-me...

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 ?

Text Solution

Verified by Experts

The ammoniated electrons are responsible for the blue colour of the solution .
`M+(x+y)NH_3 to [M(NH_3)_x]^(+)+ underset("Ammoniated electrons")([e(NH_3)_y]^(-)`
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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) Which alkali metal hydroxide is thermally unstable ?

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) Complete the reaction : KO_2 + H_2O to

Knowledge Check

  • The alkali metal that reacts with nitrogen directly to form nitride is

    A
    `Li`
    B
    `Na`
    C
    `K`
    D
    `Rb`

  • The alkali metal that reacts with nitrogen directly to form nitride is

    A
    Na
    B
    K
    C
    Pb
    D
    Li.

  • Alkali metal hydrides react with water to give

    A
    Acidic solution
    B
    Basic solution
    C
    Neutral solution
    D
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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) Arrange the following alkali metal ions in the decreasing order of their mobility in aqueous solutions: Li^(+), Na^(+),K^(+),Rb^(+)

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