NEET2019Chemistry-Chemical Kinetics
NEET 2019 Chemistry First order reactions MCQ Question
Type: MCQ-numerical-Medium-Class 12
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 ______.
A
t = 6.909/k
B
t = 4.606/k
C
t = 2.303/k
D
t = 0.693/k
Correct Answer
Option B
Detailed Explanation
For a first order reaction, the time required for 99% completion is given by t = (2.303/k) × log(100/1) = 6.909/k.
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