AIPMT MAINS2011Chemistry-Chemical Kinetics
AIPMT MAINS 2011 Chemistry Half-Life MCQ Question
Type: MCQ-numerical-Medium-Class 12
The half life of a substance in a certain enzyme-catalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L⁻¹ to 0.04 mg L⁻¹ is
A
690 s
B
276 s
C
414 s
D
552 s
Correct Answer
Option A
Detailed Explanation
The concentration falls to 0.04 mg L⁻¹ from 1.28 mg L⁻¹ in five half-lives, which is 5 × 138 s = 690 s.
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