For a first-order reaction, the relation between rate constant and half-life is $t_{1/2} = 0.693/k$. If $k = 2.31 \times 10^{-2}$ s⁻¹, then $t_{1/2}$ is approximately:
A30 s
B100 s
C10 s
D300 s
Answer & Solution
Correct answer: A. 30 s
$t_{1/2} = 0.693/(2.31\times10^{-2}) \approx 30$ s. Independent of initial concentration — a signature of first-order kinetics.
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