NEET UG 2019 · Chemistry · Question 63
NEET 2019 Chemistry, question 63
Question 63 of the NEET 2019 paper (code P1) is a Chemistry question from Chemical Kinetics. Its idea, First Order Percentage Completion Time Shortcuts, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 3.
Updated 2026-10-08
Q63 · Chemistry
If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by :
- 1t = 0.693/k
- 2t = 6.909/k
- 3t = 4.606/kOfficial answer
- 4t = 2.303/k
Official answer: option 3 · NTA final answer key
Same idea
The only question on First Order Percentage Completion Time Shortcuts
No other NEET paper from 2017–2026 tested this exact idea.
First Order Percentage Completion Time Shortcuts: every question and how it was framed
The chapter
Chemical Kinetics in ten years of NEET
21 questions from 2017–2026, asked in 10 of 10 papers, about 2.0 a paper. Chemical Kinetics alone had 21.