NEET UG 2026 · Chemistry · Question 70
NEET 2026 Chemistry, question 70
Question 70 of the NEET 2026 paper (re-exam) is a Chemistry question from Classification of Elements and Periodicity in Properties. Its idea, Ionization Enthalpy Anomaly: Nitrogen vs Oxygen, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 1.
Updated 2026-10-08
Q70 · Chemistry
Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The first ionization enthalpy of O is lower than that of N and F.
Reason R : The loss of an electron from O leads to stable half-filled p orbital.
In light of the above statements, choose the most appropriate answer from the options given below:
- 1Both A and R are correct and R is the correct explanation of A.Official answer
- 2Both A and R are correct and R is NOT the correct explanation of A.
- 3A is correct but R is not correct.
- 4A is not correct but R is correct.
Official answer: option 1 · NTA final answer key
Same idea
The only question on Ionization Enthalpy Anomaly: Nitrogen vs Oxygen
No other NEET paper from 2017–2026 tested this exact idea.
Ionization Enthalpy Anomaly: Nitrogen vs Oxygen: every question and how it was framed
The chapter
Classification of Elements and Periodicity in Properties in ten years of NEET
13 questions from 2017–2026, asked in 9 of 10 papers, about 1.3 a paper. Periodic Properties alone had 13.