STANDARDChemistry-Chemical Kinetics
STANDARD Chemistry First Order Reactions MCQ Question
Type: MCQ-numerical-Medium-Class 12
For a first order reaction, A → P, t₁/₂ (half-life) is 10 days. The time required for 1/4th conversion of A (in days) is (ln 2 = 0.693, ln 3 = 1.1)
A
5
B
4.1
C
3.2
D
2.5
Correct Answer
Option B
Detailed Explanation
For a first order reaction, t = (2.303/k) log([A]₀/[A]). Using the given half-life, k = 0.693/10. For 1/4th conversion, [A] = 3/4[A]₀. Solving gives t ≈ 4.1 days.
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