STANDARD Chemistry First Order Reactions MCQ Question
The time taken for 90% of a first order reaction to complete is approximately
1.1 times that of the half-life
2.2 times that of the half-life
3.3 times that of the half-life
4.4 times that of the half-life
Correct Answer
Detailed Explanation
For a first order reaction, the time taken for 90% completion is given by t₉₀% = 2.303/k log(10/1) = 3.3 times the half-life t₁/₂.
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