Half-life period of a first-order reaction is 1386 seconds. The specific rate constant of the reaction is :

1. A. 5.0 10 -2 s -1
2. B. 5.0 10 -3 s -1
3. C. 0.5 10 -2 s -1
4. D. 0.5 10 -3 s -1

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