STANDARDChemistry-Chemical Kinetics
STANDARD Chemistry First Order Reactions MCQ Question
Type: MCQ-numerical-Medium-Class 12
The time taken for 90% of a first order reaction to complete is approximately
A
1.1 times that of the half-life
B
2.2 times that of the half-life
C
3.3 times that of the half-life
D
4.4 times that of the half-life
Correct Answer
Option C
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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