JEE Main 2026 — Classification of Elements and Periodicity in Properties Question with Solution
JEE Main 2026 (22 January Shift 2)
Question
Given below are two statements :
Statement I: is the correct order in terms of first ionization enthalpy values.
Statement II: is the correct order in terms of the magnitude of electron gain enthalpy values.
In the light of the above statements, choose the correct answer from the options given below :
Statement I: is the correct order in terms of first ionization enthalpy values.
Statement II: is the correct order in terms of the magnitude of electron gain enthalpy values.
In the light of the above statements, choose the correct answer from the options given below :
Choose an option
Show full solutionCorrect option: D
Correct answer
DBoth Statement I and Statement II are true
Step-by-step explanation
Statement I:
Ionization enthalpy generally increases across a period from left to right.
However, Nitrogen () has a stable half-filled electronic configuration, making it harder to remove an electron compared to Oxygen ().
Thus, the order is .
Statement I is true.
Statement II:
For Group 16 elements, Oxygen has an exceptionally low magnitude of electron gain enthalpy due to its small size and high inter-electronic repulsions in the subshell.
The magnitude of electron gain enthalpy decreases down the group from Sulphur onwards.
The correct order of magnitude is .
Statement II is true.
Both statements are correct.
Ionization enthalpy generally increases across a period from left to right.
However, Nitrogen () has a stable half-filled electronic configuration, making it harder to remove an electron compared to Oxygen ().
Thus, the order is .
Statement I is true.
Statement II:
For Group 16 elements, Oxygen has an exceptionally low magnitude of electron gain enthalpy due to its small size and high inter-electronic repulsions in the subshell.
The magnitude of electron gain enthalpy decreases down the group from Sulphur onwards.
The correct order of magnitude is .
Statement II is true.
Both statements are correct.
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This is a previous-year question from JEE Main 2026, 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.