JEE MAIN - Chemistry (2022 - 28th July Morning Shift - No. 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 :
(A) and (B) only
(B) and (C) only
(A) and (C) only
(C) and (D) only
Explanation
$\mathrm{Rb} \,\& \,\mathrm{Cs}$ have nearly same electron gain enthalpy electron gain enthalpy $=-46\, \mathrm{kj} / \mathrm{ml}$
Ar & Kr have same $\Delta \mathrm{H}_{\mathrm{eq}} .$ Value is $+96 \,\mathrm{kj} / \mathrm{ml}$
Ar & Kr have same $\Delta \mathrm{H}_{\mathrm{eq}} .$ Value is $+96 \,\mathrm{kj} / \mathrm{ml}$
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