AIPMT PRELIMS2007Chemistry-Chemical Kinetics
AIPMT PRELIMS 2007 Chemistry First-order Reactions MCQ Question
Type: MCQ-numerical-Medium-Class 12
In a first-order reaction A → B, if k is rate constant and initial concentration of the reactant A is 0.5 M, then the half-life is
A
log 2/k
B
log 2/k√0.5
C
ln 2/k
D
0.693/0.5k
Correct Answer
Option C
Detailed Explanation
The half-life of a first-order reaction is given by t₁/₂ = 0.693/k or ln 2/k, independent of initial concentration.
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