Chemistry-Order of Reaction
NEET Chemistry Order of Reaction MCQ Question
Type: MCQ-numerical-Hard-Class 12
If the concentration of a reactant A is reduced from [A]0 to [A]/4 in 20 minutes for a first-order reaction, what is the rate constant k?
A
0.069 min^-1
B
0.035 min^-1
C
0.023 min^-1
D
0.015 min^-1
Correct Answer
Option A
Detailed Explanation
For a first-order reaction, ln([A]/[A]0) = -kt. If [A] = [A]0/4 when t = 20 min, then ln(1/4) = -k * 20. Solving gives k = 0.069 min^-1.
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