Chemistry-Order of Reaction
NEET Chemistry Order of Reaction MCQ Question
Type: MCQ-numerical-Medium-Class 12
For a first-order reaction, the concentration of a reactant decreases from 0.8 mol/L to 0.2 mol/L in 4 hours. What is the rate constant (k) for the reaction?
A
0.347 h^-1
B
0.693 h^-1
C
0.173 h^-1
D
0.115 h^-1
Correct Answer
Option A
Detailed Explanation
Using the first-order rate equation ln([R]_0/[R]) = kt, substituting the given values, ln(0.8/0.2) = k * 4 gives k = 0.347 h^-1.
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