A, B, C, D and E(Francium is not included in the list) are the elements belonging to First group of Modern periodic table. The trend of ionic coductance in aqueous solution is  A+ > B+ > C+ > D+ > E+. The element ‘D’ in the sequence is

A, B, C, D and E(Francium is not included in the list) are the elements belonging to First group of Modern periodic table. The trend of ionic coductance in aqueous solution is  A+ > B+ > C+ > D+ > E+. The element ‘D’ in the sequence is

  1. A

    K

  2. B

    Na

  3. C

    Cs

  4. D

    Rb

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    Solution:

    A) Atomic radius…Li<Na<K<Rb<Cs;

    B)IP1…..Li>Na>K>Rb>Cs;

    C) EN…..Li>Na>K=Rb>Cs;

    D) MP…Li>Na>K>Rb>Cs;

    E) BP…Li>Na>K>Rb>Cs;

    F) Hardness, Metallic bond strength….Li>Na>K>Rb>Cs;

    G) Metallic character….Li<Na<K<Rb<Cs;

    H) Density…..Li<K<Na<Rb<Cs;

         Due larger inter atomic distances available vacant orbitals Potassium is less denser than Sodium.

    I) Abundance in Earth's crust….Na>K>Rb>Li>Cs;

    J) Hydration Enthalpy….Li+>Na+>K+>Rb+>Cs+

    Thus ionic size in aqueous solution…..Li+>Na+>K+>Rb+>Cs+

    Thus ionic mobility in aqueous solution…..Li+<Na+<K+<Rb+<Cs+ 

    but ionic mobility in fused state ……Li+>Na+>K+>Rb+>Cs+

    K) EM+/M° values are negative.

    Most negative for Li and least negative for Na.

    ELi+/Li°most negative<ECs+/Cs°<ERb+/Rb°<EK+/K°<ENa+/Na°least negative

    Best reducing agent is Lithium, best oxidant is Na+;

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