JEE Main 2024 — Classification of Elements and Periodicity in Properties Question with Solution
JEE Main 2024 (29 Jan Shift 2)
Question
Statement I: Fluorine has most negative electron gain enthalpy in its group.
Statement II: Oxygen has least negative electron gain enthalpy in its group.
In the light of the above statements, choose the most appropriate from the options given below.
Choose an option
Show full solutionCorrect option: D
Step-by-step explanation
Statement-1 is false because chlorine has most negative electron gain enthalpy in its group.
The size of fluorine is comparatively smaller due to which there exists force of repulsion between the valence electrons and they also repel the incoming electron but the size of chlorine is comparatively larger and it easily attains one electron to become stable
Thus, the electron gain enthalpy of chlorine is more negative than that of fluorine.
Oxygen has least negative electron gain enthalpy in its group, due to its small size. As a result of which the electron -electron repulsion in the relatively small p subshell are comparatively large and hence the incoming electrons are not accepted with the same ease in case of other elements of the group.
Hence option D is the answer.
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This is a previous-year question from JEE Main 2024, covering the Classification of Elements and Periodicity in Properties chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.