NEET UG 2020 · Chemistry · Question 120
NEET 2020 Chemistry, question 120
Question 120 of the NEET 2020 paper (code E1) is a Chemistry question from The p-Block Elements (Class 11). Its idea, Mechanism of Carbon Monoxide Toxicity, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 3.
Updated 2026-10-08
Q120 · Chemistry
Which of the following is not correct about carbon monoxide ?
- 1It forms carboxyhaemoglobin.
- 2It reduces oxygen carrying ability of blood.
- 3The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin.Official answer
- 4It is produced due to incomplete combustion.
Official answer: option 3 · NTA final answer key
Same idea
The only question on Mechanism of Carbon Monoxide Toxicity
No other NEET paper from 2017–2026 tested this exact idea.
Mechanism of Carbon Monoxide Toxicity: every question and how it was framed
The chapter
The p-Block Elements (Class 11) in ten years of NEET
13 questions from 2017–2026, asked in 7 of 10 papers, about 1.3 a paper. p-Block (Group 13-14) alone had 12.