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Question: Answered & Verified by Expert
The half life of a first order reaction is $69.35 \mathrm{sec}$. The value of the rate constant of the reaction is
ChemistryChemical KineticsJEE Main
Options:
  • A $1.0 \mathrm{~s}^{-1}$
  • B $0.1 \mathrm{~s}^{-1}$
  • C $0.01 \mathrm{~s}^{-1}$
  • D $0.001 \mathrm{~s}^{-1}$
Solution:
1631 Upvotes Verified Answer
The correct answer is: $0.01 \mathrm{~s}^{-1}$
$k=\frac{0.693}{t_{1 / 2}}=\frac{0.693}{69.35}=9.99 \times 10^{-3}=0.01 \mathrm{~s}^{-1}$

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