Verified Solution • 2025–26 Session moderate

QJEEM22Ch74c7: JEE Main 2022 Chemistry - Class 11 JEEM22Ch74c7 Solution: In which of the following pairs, electron gain enthalpies of…

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 :

Multiple Choice Options

  • A (A) and (B) only
  • B (B) and (C) only
  • C (A) and (C) only
  • D (C) and (D) only

Step-by-Step Verified Solution

Rb & Cs\mathrm{Rb} \,\& \,\mathrm{Cs} have nearly same electron gain enthalpy electron gain enthalpy =−46 kj/ml=-46\, \mathrm{kj} / \mathrm{ml}

Ar & Kr have same ΔHeq.\Delta \mathrm{H}_{\mathrm{eq}} . Value is +96 kj/ml+96 \,\mathrm{kj} / \mathrm{ml}

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