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Compared the 2nd Ionisation enthalpies a...

Compared the 2nd Ionisation enthalpies and Hydration enthalpies of Alkali and Alkaline earth metals/ions.

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Alkali metals have higher value of 2nd ionization enthalpy than alkaline earth metals since they achieve as stable noble gas configuration after loosing 1 electron from `ns^(1)` shell.
Alkaline earth metal ions have higher value of hydration enthapy because of their small ionic size than alkali metals.
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Knowledge Check

  • Ionisation enthalpy is lowest for:

    A
    Inert gases
    B
    Alkali metals
    C
    Halogens
    D
    Alkaline earth metals.

  • The correct order of hydration enthalpies of alkali metal ions is

    A
    `Na^+ gt Li^+ gt K^+ gt Rb^+ gt Cs^+`
    B
    `Li^+ gt Na^+ gt K^+ gt Cs^+ gt Rb^+`
    C
    `Na^+ gt Li^+ gt K^+ gt Cs^+ gt Rb^+`
    D
    `Li^+ gt Na^+ gt K^+ gt Rb^+ gt Cs^+`

  • The least soluble alkaline earth metal sulphate is :

    A
    `MgSO_(4)`
    B
    `CaSO_(4)`
    C
    `SrSO_(4)`
    D
    `BaSO_(4)`

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    Compared to first ionization enthalpy of an atom, the second is :

    Name the alkali metal which has high hydration enthalpy.

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