STANDARDChemistry-Chemical Kinetics
STANDARD Chemistry First Order Reactions MCQ Question
Type: MCQ-numerical-Medium-Class 12
A first order reaction is 20% complete in 10 minutes. What is the specific rate constant for the reaction?
A
0.0970 min⁻¹
B
0.009 min⁻¹
C
0.0223 min⁻¹
D
2.223 min⁻¹
Correct Answer
Option C
Detailed Explanation
For a first order reaction, the rate constant k can be calculated using the formula k = 2.303/t log(1/(1-x)), where x is the fraction completed. Here, x = 0.2 and t = 10 min. Substituting the values, k = 0.0223 min⁻¹.
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