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Chemical Kinetics — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryChemical Kinetics1 Mark
Question
Find two third $\left( t \frac{2}{3}\right)$ life span for first order reaction (Given : $k =5.48 \times 10^{-14}$ second) :
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Answer

a

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