STANDARDChemistry-Chemical Kinetics
STANDARD Chemistry First Order Reactions MCQ Question
Type: MCQ-numerical-Medium-Class 12
For a first order reaction, the time required for completion of 90% reaction is 'x' times the half-life of the reaction. The value of 'x' is: (Given: ln 10 = 2.303 and log 2 = 0.3010)
A
1.12
B
2.43
C
3.32
D
33.31
Correct Answer
Option C
Detailed Explanation
For a first order reaction, t₉₀% = (2.303/k) log(100/10). Using the relation t₁/₂ = 0.693/k, we find x = t₉₀%/t₁/₂ = 3.32.
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