Chemistry-Order of Reaction
NEET Chemistry Order of Reaction MCQ Question
Type: MCQ-numerical-Hard-Class 12
For a first-order reaction, if the concentration of the reactant decreases from 0.8 M to 0.2 M in 40 minutes, what is the rate constant (k) in mi?
A
0.0347
B
0.0250
C
0.0173
D
0.0100
Correct Answer
Option A
Detailed Explanation
Using the integrated rate equation for a first-order reaction, ln([R]0/[R]) = kt, and substituting [R]0 = 0.8 M, [R] = 0.2 M, t = 40 min, we get k = (1/40) ln(4) = 0.0347 mi.
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