Chemistry-Order of Reaction
NEET Chemistry Order of Reaction MCQ Question
Type: MCQ-numerical-Easy-Class 12
For a first-order reaction, if the concentration of the reactant decreases from 0.8 M to 0.2 M in 40 seconds, what is the rate constant k?
A
0.0347 s^-1
B
0.0173 s^-1
C
0.0694 s^-1
D
0.1388 s^-1
Correct Answer
Option A
Detailed Explanation
Using the equation ln([R]0/[R]) = kt, where [R]0 = 0.8 M and [R] = 0.2 M, and t = 40s, we calculate k = ln(0.8/0.2)/40 = 0.0347 s^-1.
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