Which is the correct relation between rate constant and half-life of a first-order reaction?
- A$k \times t_{1/2} = 0.693$
- B$t_{1/2} = \frac{k}{0.693}$
- C$k \times t_{1/2} = \frac{1}{0.639}$
- D$k \times 0.693 = t_{1/2}$
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