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The rate of first-order reaction is 0.04...

The rate of first-order reaction is 0.04 mol `L^-1 s^-1` at 10 seconds and 0.03 mol `L^-1 s^-1`at 20 seconds after initiation of the reaction. The half-life period of the reaction is

A

44.1 s

B

54.1 s

C

24.1 s

D

34.1 s

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