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The half life of a substance in a certai...

The half life of a substance in a certain enzyme catalyzed reaction is 138s. The time required for the concentration of the substance to fall from `1.28 mg L^(-1) to 0.04 mg L^(-1)` :

A

690 s

B

276 s

C

414 s

D

552 s

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The correct Answer is:
A
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