NEET2025Chemistry-Chemical Kinetics
NEET 2025 Chemistry First Order Reactions MCQ Question
Type: MCQ-numerical-Medium-Class 12
If the half-life (t₁/₂) for a first order reaction is 1 minute, then the time required for 99.9% completion of the reaction is closest to:
A
2 minutes
B
4 minutes
C
5 minutes
D
10 minutes
Correct Answer
Option D
Detailed Explanation
For a first order reaction, the time required for 99.9% completion is approximately 10 times the half-life, which is 5 minutes.
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