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Chemistry · PYQ NEET UG 2019(1)
हिन्दीIf the rate constant for a first order reaction is \( \text{k} \), the time (\( \text{t} \)) required for the completion of \( 99\% \) of the reaction is given by _________.
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Correct answer · Option B
\( \text{t} = 4.606/\text{k} \)
Explanation
For a first order reaction, \( \text{t} = \frac{2.303}{\text{k}}\log\frac{[\text{A}]_0}{[\text{A}]_{\text{t}}} = \frac{2.303}{\text{k}}\log\frac{100}{1} = \frac{2.303 \times 2}{\text{k}} = \frac{4.606}{\text{k}} \).
