Chemistry-Rate of Reaction
NEET Chemistry Rate of Reaction MCQ Question
Type: MCQ-numerical-Easy-Class 12
For a first order reaction with a rate constant k = 5.5 × 10^-14 s^-1, what is the time required for 99.9% completion of the reaction?
A
26 × 10^14 s
B
26 × 10^13 s
C
6.93 × 10^13 s
D
6.93 × 10^12 s
Correct Answer
Option A
Detailed Explanation
For a first order reaction, time for 99.9% completion is 10 times the half-life. The half-life is calculated using t_1/2 = 0.693/k = 1.26 × 10^13 s, thus 99.9% completion time is 10 × t_1/2 = 1.26 × 10^14 s.
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