NEET UG 2021 · Chemistry · Question 95
NEET 2021 Chemistry, question 95
Question 95 of the NEET 2021 paper (code O1) is a Chemistry question from Structure of Atom. Its idea, Isoelectronic Species Configurations, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 2.
Updated 2026-10-08
Q95 · Chemistry
From the following pairs of ions which one is not an iso-electronic pair ?
- 1,
- 2, Official answer
- 3,
- 4,
Official answer: option 2 · NTA final answer key
Same idea
The only question on Isoelectronic Species Configurations
No other NEET paper from 2017–2026 tested this exact idea.
Isoelectronic Species Configurations: every question and how it was framed
The chapter
Structure of Atom in ten years of NEET
16 questions from 2017–2026, asked in 10 of 10 papers, about 1.5 a paper. Quantum Numbers alone had 16.