1. Tardigrade
  2. Question
  3. Chemistry
  4. In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical ? (A) Rb and Cs (B) Na and K (C) Ar and Kr (D) I and At Choose the correct answer from the options given below :

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Q. In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical ?
(A) $Rb$ and $Cs$
(B) $Na$ and $K$
(C) $Ar$ and $Kr$
(D) $I $ and $At$
Choose the correct answer from the options given below :

JEE MainJEE Main 2022Classification of Elements and Periodicity in Properties

Solution:

$Rb$ & $Cs$ have nearly same electron gain enthalpy electron gain enthalpy $=-46 kj / ml\, Ar$ & $Kr$ have same $\Delta H _{ eq }$. Value is $+96$ $kj / ml$