In a first-order reaction \( \mathrm{A} \rightarrow \mathrm{B} \), if \( \mathrm{k} \) is rate c...

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In a first-order reaction \( \mathrm{A} \rightarrow \mathrm{B} \), if \( \mathrm{k} \) is rate constant and inital concentration of the reactant \( \mathrm{A} \) is \( 0.5 \mathrm{M} \), then the halflife is
(a) \( \frac{\log 2}{\mathrm{k}} \)
(b) \( \frac{\log 2}{\mathrm{k} \sqrt{0.5}} \)
(c) \( \frac{\ln 2}{\mathrm{k}} \)
(d) \( \frac{0.693}{0.5 \mathrm{k}} \)
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