Home/
Competitive Exams/
NEET/
Chemistry/
Classification of Elements and Periodicity in Properties/
Question 30024
NEET Chemistry · Hard

Classification of Elements and Periodicity in Properties: Ionization anomaly MCQ

Solve this quality-checked NEET multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
Ionization anomalyHardQuestion 30024

Question

The first ionization enthalpy of oxygen is lower than nitrogen because oxygen has:

  1. A
    paired electrons in one p-orbital causing repulsion
    Correct
  2. B
    half-filled p-subshell stability
  3. C
    larger size only
  4. D
    fewer protons

Correct answer

paired electrons in one p-orbital causing repulsion

Explanation

Nitrogen's half-filled p3^3 configuration is especially stable.

Review Classification of Elements and Periodicity in Properties notesStart timed chapter practice