A, B, C, D and E ( Radium is not included ) are the elements belonging to Second group of Modern periodic table. The correct trend of hydration enthalpy for these ions is  A2+ > B2+ > C2+ > D2+ > E2+. The element ‘C’ in the sequence is

A, B, C, D and E ( Radium is not included ) are the elements belonging to Second group of Modern periodic table. The correct trend of hydration enthalpy for these ions is  A2+ > B2+ > C2+ > D2+ > E2+. The element ‘C' in the sequence is

  1. A

    Ca

  2. B

    Mg

  3. C

    Sr

  4. D

    Ba

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    Solution:

    A) Atomic radius…Be<Mg<Ca<Sr<Ba ;

    B) IP1…..Be>Mg>Ca>Sr>Ra>Ba;

    C) EN…..Be>Mg>Ca=Sr>Ba>Ra;

    D) MP…Be>Ca>Sr>Ba>Ra>Mg ;

    E) BP…Be>Ba>Ra>Ca>Sr>Mg ;

    F) Density…..Ra>Ba>Sr>Be>Mg>Ca ;

    G) Abundance in Earth's crust….Ca>Mg>Ba>Sr>Be>Ra ;

    H) Hydration Enthalpy….Be2+>Mg2+>Ca2+>Sr2+>Ba2+

    I) EM2+/M° values are negative.

    Most negative for Ra=Ba and least negative for Be.

    J) ERa2+/Ra°(most negative)=EBa2+/Ba°<ESr2+/Sr°<ECa2+/Ca°<EMg2+/Mg°<EBe2+/Be°least negative

    Best reducing agent is Ra=Ba, best oxidant is Be2+;

    K) Reducing power…Be<Mg<Ca<Sr<Ba=Ra ;

    L) Oxidizing power… Be2+ > Mg2+ > Ca2+ > Sr2+ > Ba2+ = Ra2+ ;

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