A, P, X, B, Q and E are the elements belonging to 18th group of Modern periodic table. The correct trend of boiling point in these elements is A > P > X > B > Q > E. The element ‘B’ in the sequence is

A, P, X, B, Q and E are the elements belonging to 18th group of Modern periodic table. The correct trend of boiling point in these elements is A > P > X > B > Q > E. The element ‘B’ in the sequence is

  1. A

    Xe

  2. B

    Rn

  3. C

    Kr

  4. D

    Ar

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    Solution:

    Atomic radius….He<Ne<Ar<Kr<Xe;

    Density ….He<Ne<Ar<Kr<Xe<Rn;

    IP ….He>Ne>Ar>Kr>Xe>Rn;

    Positive electron gain enthalpy ….Ne>Ar=Kr>Xe>Rn>He;Due to stable configuration

    MP and BP…..He<Ne<Ar<Kr<Xe<Rn; Due to incease in the strength of Vanderwaals attractions

    Abundance in atmosphere(by volume)…..Ar>Ne>He>Kr>Xe;

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