NEETChemistry-Chemical Kinetics
NEET Chemistry First Order Reactions MCQ Question
Type: MCQ-numerical-Medium-Class 12
A first order reaction takes 40 min for 30% decomposition. What will be t₁/₂?
A
77.7 min
B
52.5 min
C
46.2 min
D
22.7 min
Correct Answer
Option B
Detailed Explanation
For a first order reaction, t₁/₂ = 0.693/k. Using the formula k = 2.303/t log(a/a-x), we can calculate k and then find t₁/₂.
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