Question
If the half-life ( t _ 1 / 2 ) for a first order reaction is 1 minutes, then the time required for 99.9 \% completion of the reaction is closest to:
NEET
Chemistry
Chemical Kinetics
2025
NEET 2025
NEET Chemistry Question (2025) — Solution
Options
- A. 2 minutes
- B. 4 minutes
- C. 5 minutes
- D. 10 minutes
Answer
D. 10 minutes
Step-by-step solution
For 1^ st order reactions : aligned t _ 99.90 \% & =10 t _ 1 / 2 \\ t _ 99.9 \% & =10 1 \\ & =10 minute aligned
Related: Chemistry — Chemical Kinetics · All PYQ Banks