STANDARDChemistry-Chemical Kinetics
STANDARD Chemistry First Order Reactions MCQ Question
Type: MCQ-numerical-Medium-Class 12
The half-life of the reaction X → Y, following first order kinetics, when the initial concentration of X is 0.01 mol L⁻¹ and initial rate is 0.00352 mol L⁻¹ min⁻¹ will be:
A
19.69 min.
B
1.969 min.
C
7.75 min.
D
77.5 min.
Correct Answer
Option B
Detailed Explanation
For a first order reaction, the rate constant k is calculated using the formula: k = rate/[X]. Substituting the given values, k = 0.352. The half-life t₁/₂ is calculated using the formula: t₁/₂ = 0.693/k, which gives t₁/₂ = 1.969 min.
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