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The half-life of a substance in a certain enzyme-catalyzed reaction is 138 s. The time required for the concentration

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The half-life of a substance in a certain enzyme-catalyzed 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) 414 s
(b) 552 s
(c) 690 s
(d) 276 s

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Correct option is (c) 690 s

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