JEE Main 2022 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties JEE Main 2022

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)(a) and (b) only
(B)(b) and (c) only
(C)(a) and (c) onlyCorrect
(D)(c) and (d) only

Answer: (C)

Solution

The electron gain enthalpies of Rb and Cs are nearly identical (about −47 and −46 kJ ). The noble

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Question ID VK-034750