AIPMT PRELIMS2009Chemistry-Chemical Kinetics
AIPMT PRELIMS 2009 Chemistry First-order Reactions MCQ Question
Type: MCQ-numerical-Medium-Class 12
Half life period of a first-order reaction is 1386 seconds. The specific rate constant of the reaction is:
A
0.5 × 10⁻² s⁻¹
B
0.5 × 10⁻³ s⁻¹
C
5.0 × 10⁻² s⁻¹
D
5.0 × 10⁻³ s⁻¹
Correct Answer
Option B
Detailed Explanation
The rate constant k for a first-order reaction is calculated using the formula k = 0.693 / t₁/₂. Substituting the given half-life, k = 0.693 / 1386 = 0.5 × 10⁻³ s⁻¹.
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